diff --git a/LICENSE b/LICENSE
index a7b94b0..c09a9cc 100644
--- a/LICENSE
+++ b/LICENSE
@@ -2,182 +2,207 @@ CadQuery
 Copyright (C) 2015  Parametric Products Intellectual Holdings, LLC
 
 This library is free software; you can redistribute it and/or
-modify it under the terms of the GNU Lesser General Public
-License as published by the Free Software Foundation; either
-version 2.1 of the License, or (at your option) any later version.
-
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-Lesser General Public License for more details.
-
-You should have received a copy of the GNU Lesser General Public
-License along with this library; if not, write to the Free Software
-Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+modify it under the terms of the Apache Public License, v 2.0
 
 
-                   GNU LESSER GENERAL PUBLIC LICENSE
-                       Version 3, 29 June 2007
+                                 Apache License
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diff --git a/README.md b/README.md
index cc1a67d..f9d41e7 100644
--- a/README.md
+++ b/README.md
@@ -57,7 +57,8 @@ CadQuery scripts have several key advantages over OpenSCAD:
 License
 ========
 
-CadQuery is licensed under the terms of the LGPLv3. http://www.gnu.org/copyleft/lesser.html
+CadQuery is licensed under the terms of the Apache Public License, version 2.0.
+A copy of the license can be found at http://www.apache.org/licenses/LICENSE-2.0
 
 Where is the GUI?
 ==================
diff --git a/cadquery.egg-info/PKG-INFO b/cadquery.egg-info/PKG-INFO
index a12e07e..a6a1f17 100644
--- a/cadquery.egg-info/PKG-INFO
+++ b/cadquery.egg-info/PKG-INFO
@@ -5,7 +5,7 @@ Summary: CadQuery is a parametric  scripting language for creating and traversin
 Home-page: https://github.com/dcowden/cadquery
 Author: David Cowden
 Author-email: dave.cowden@gmail.com
-License: LGPL
+License: Apache Public License
 Description: What is a CadQuery?
         ========================================
         
@@ -33,13 +33,6 @@ Description: What is a CadQuery?
         It has tons of awesome features like integration with FreeCAD so you can see your objects, code-autocompletion, an examples bundle, and script saving/loading. Its definitely the best way to kick the tires!
         
         
-        Recently Added Features
-        ========================================
-        
-        * 12/5/14 -- New FreeCAD/CadQuery Module!  https://github.com/jmwright/cadquery-freecad-module
-        * 10/25/14 -- Added Revolution Feature ( thanks Jeremy ! )
-        
-        
         Why CadQuery instead of OpenSCAD?
         ========================================
         
@@ -67,7 +60,7 @@ Description: What is a CadQuery?
         License
         ========
         
-        CadQuery is licensed under the terms of the LGPLv3. http://www.gnu.org/copyleft/lesser.html
+        CadQuery is licensed under the terms of the Apache Public License, v 2.0 http://www.apache.org/licenses/LICENSE-2.0
         
         Where is the GUI?
         ==================
diff --git a/cadquery/cqgi.py b/cadquery/cqgi.py
index 4cf9d88..92fd860 100644
--- a/cadquery/cqgi.py
+++ b/cadquery/cqgi.py
@@ -81,7 +81,7 @@ class CQModel(object):
         :param build_parameters: a dictionary of variables. The variables must be
         assignable to the underlying variable type.
         :raises: Nothing. If there is an exception, it will be on the exception property of the result.
-        This is the interface so that we can return other information onthe result, such as the build time
+        This is the interface so that we can return other information on the result, such as the build time
         :return: a BuildResult object, which includes the status of the result, and either
         a resulting shape or an exception
         """
@@ -309,7 +309,7 @@ class InvalidParameterError(Exception):
 
 class NoOutputError(Exception):
     """
-    Raised when the script does not execute the build_output() method to
+    Raised when the script does not execute the build_object() method to
     return a solid
     """
     pass
diff --git a/doc/cqgi.rst b/doc/cqgi.rst
index f8cb0dc..6e47b91 100644
--- a/doc/cqgi.rst
+++ b/doc/cqgi.rst
@@ -61,7 +61,7 @@ If the script was successful, the results property will include a list of result
 
 If the script failed, the exception property contains the exception object.
 
-If your have a way to get inputs from a user, you can override any of the constants defined in the user script
+If you have a way to get inputs from a user, you can override any of the constants defined in the user script
 with new values::
 
     from cadquery import cqgi
diff --git a/doc/designprinciples.rst b/doc/designprinciples.rst
index 848e4ea..a74c8c3 100644
--- a/doc/designprinciples.rst
+++ b/doc/designprinciples.rst
@@ -38,7 +38,7 @@ If you have experience with 3D CAD systems, you also know that there is a key de
 After the base block is created, how the hole is located is key.  If it is located from one edge, changing the block
 size will have a different affect than if the hole is located from the center.
 
-Many scripting langauges to not provide a way to capture design intent-- because they require that you always work in
+Many scripting langauges do not provide a way to capture design intent-- because they require that you always work in
 global coordinates.  CadQuery is different-- you can locate features relative to others in a relative way-- preserving
 the design intent just like a human would when creating a drawing or building an object.
 
diff --git a/doc/examples.rst b/doc/examples.rst
index 4cce28d..0705da5 100644
--- a/doc/examples.rst
+++ b/doc/examples.rst
@@ -42,7 +42,7 @@ Just about the simplest possible example, a rectangular box
 
 .. cq_plot::
 
-    result = cadquery.Workplane("front").box(2.0,2.0,0.5)
+    result = cadquery.Workplane("front").box(2.0, 2.0, 0.5)
     build_object(result)
 
 .. topic:: Api References
@@ -96,7 +96,7 @@ By default, rectangles and circles are centered around the previous working poin
 
 .. cq_plot::
 
-    result = cq.Workplane("front").circle(2.0).rect(0.5,0.75).extrude(0.5)
+    result = cq.Workplane("front").circle(2.0).rect(0.5, 0.75).extrude(0.5)
     build_object(result)
 
 .. topic:: Api References
@@ -121,7 +121,7 @@ closed curve.
 
 .. cq_plot::
 
-    result = cq.Workplane("front").lineTo(2.0,0).lineTo(2.0,1.0).threePointArc((1.0,1.5),(0.0,1.0))\
+    result = cq.Workplane("front").lineTo(2.0, 0).lineTo(2.0, 1.0).threePointArc((1.0, 1.5),(0.0, 1.0))\
         .close().extrude(0.25)
     build_object(result)
 
@@ -149,9 +149,9 @@ A new work plane center can be established at any point.
 .. cq_plot::
 
     result = cq.Workplane("front").circle(3.0) #current point is the center of the circle, at (0,0)
-    result = result.center(1.5,0.0).rect(0.5,0.5) # new work center is  (1.5,0.0)
+    result = result.center(1.5, 0.0).rect(0.5, 0.5) # new work center is  (1.5, 0.0)
 
-    result = result.center(-1.5,1.5).circle(0.25) # new work center is ( 0.0,1.5).
+    result = result.center(-1.5, 1.5).circle(0.25) # new work center is ( 0.0, 1.5).
     #the new center is specified relative to the previous center, not global coordinates!
 
     result = result.extrude(0.25)
@@ -181,7 +181,7 @@ like :py:meth:`Workplane.circle` and :py:meth:`Workplane.rect`, will operate on
 .. cq_plot::
 
    r = cq.Workplane("front").circle(2.0)                       # make base
-   r = r.pushPoints( [ (1.5,0),(0,1.5),(-1.5,0),(0,-1.5) ] )     # now four points are on the stack
+   r = r.pushPoints( [ (1.5, 0),(0, 1.5),(-1.5, 0),(0, -1.5) ] )     # now four points are on the stack
    r = r.circle( 0.25 )                                      # circle will operate on all four points
    result = r.extrude(0.125 )                               # make prism
    build_object(result)
@@ -204,8 +204,8 @@ correct for small hole sizes.
 
 .. cq_plot::
 
-    result = cq.Workplane("front").box(3.0,4.0,0.25).pushPoints ( [ ( 0,0.75 ),(0,-0.75) ]) \
-        .polygon(6,1.0).cutThruAll()
+    result = cq.Workplane("front").box(3.0, 4.0, 0.25).pushPoints ( [ ( 0,0.75 ),(0, -0.75) ]) \
+        .polygon(6, 1.0).cutThruAll()
     build_object(result)
 
 .. topic:: Api References
@@ -226,7 +226,7 @@ This example uses a polyline to create one half of an i-beam shape, which is mir
 
 .. cq_plot::
 
-        (L,H,W,t) = ( 100.0,20.0,20.0,1.0)
+        (L,H,W,t) = ( 100.0, 20.0, 20.0, 1.0)
         pts = [
             (0,H/2.0),
             (W/2.0,H/2.0),
@@ -262,15 +262,15 @@ needs a complex profile
 
     s = cq.Workplane("XY")
     sPnts = [
-        (2.75,1.5),
-        (2.5,1.75),
-        (2.0,1.5),
-        (1.5,1.0),
-        (1.0,1.25),
-        (0.5,1.0),
-        (0,1.0)
+        (2.75, 1.5),
+        (2.5, 1.75),
+        (2.0, 1.5),
+        (1.5, 1.0),
+        (1.0, 1.25),
+        (0.5, 1.0),
+        (0, 1.0)
     ]
-    r = s.lineTo(3.0,0).lineTo(3.0,1.0).spline(sPnts).close()
+    r = s.lineTo(3.0, 0).lineTo(3.0, 1.0).spline(sPnts).close()
     result = r.extrude(0.5)
     build_object(result)
 
@@ -331,7 +331,7 @@ Keep in mind that the origin of new workplanes are located at the center of a fa
 
 .. cq_plot::
 
-    result = cq.Workplane("front").box(2,3,0.5)            #make a basic prism
+    result = cq.Workplane("front").box(2,3, 0.5)            #make a basic prism
     result = result.faces(">Z").workplane().hole(0.5)   #find the top-most face and make a hole
     build_object(result)
 
@@ -359,7 +359,7 @@ how deep the part is
 
 .. cq_plot::
 
-    result = cq.Workplane("front").box(3,2,0.5)                 #make a basic prism
+    result = cq.Workplane("front").box(3,2, 0.5)                 #make a basic prism
     result = result.faces(">Z").vertices("<XY").workplane()  #select the lower left vertex and make a workplane
     result = result.circle(1.0).cutThruAll()                 #cut the corner out
     build_object(result)
@@ -387,7 +387,7 @@ This example uses an offset workplane to make a compound object, which is perfec
 
 .. cq_plot::
 
-    result = cq.Workplane("front").box(3,2,0.5)                 #make a basic prism
+    result = cq.Workplane("front").box(3, 2, 0.5)                 #make a basic prism
     result = result.faces("<X").workplane(offset=0.75)       #workplane is offset from the object surface
     result = result.circle(1.0).extrude(0.5)                 #disc
     build_object(result)
@@ -409,8 +409,8 @@ You can create a rotated work plane by specifying angles of rotation relative to
 
 .. cq_plot::
 
-    result = cq.Workplane("front").box(4.0,4.0,0.25).faces(">Z").workplane()  \
-         .transformed(offset=cq.Vector(0,-1.5,1.0),rotate=cq.Vector(60,0,0)) \
+    result = cq.Workplane("front").box(4.0, 4.0, 0.25).faces(">Z").workplane()  \
+         .transformed(offset=cq.Vector(0, -1.5, 1.0),rotate=cq.Vector(60, 0, 0)) \
          .rect(1.5,1.5,forConstruction=True).vertices().hole(0.25)
     build_object(result)
 
@@ -434,8 +434,8 @@ In the example below, a rectangle is drawn, and its vertices are used to locate
 
 .. cq_plot::
 
-    result = cq.Workplane("front").box(2,2,0.5).faces(">Z").workplane() \
-        .rect(1.5,1.5,forConstruction=True).vertices().hole(0.125 )
+    result = cq.Workplane("front").box(2, 2, 0.5).faces(">Z").workplane() \
+        .rect(1.5, 1.5, forConstruction=True).vertices().hole(0.125 )
     build_object(result)
 
 .. topic:: Api References
@@ -459,7 +459,7 @@ are removed, and then the inside of the solid is 'hollowed out' to make the shel
 
 .. cq_plot::
 
-    result = cq.Workplane("front").box(2,2,2).faces("+Z").shell(0.05)
+    result = cq.Workplane("front").box(2, 2, 2).faces("+Z").shell(0.05)
     build_object(result)
 
 .. topic:: Api References
@@ -480,8 +480,8 @@ and a circular section.
 
 .. cq_plot::
 
-    result = cq.Workplane("front").box(4.0,4.0,0.25).faces(">Z").circle(1.5) \
-        .workplane(offset=3.0).rect(0.75,0.5).loft(combine=True)
+    result = cq.Workplane("front").box(4.0, 4.0, 0.25).faces(">Z").circle(1.5) \
+        .workplane(offset=3.0).rect(0.75, 0.5).loft(combine=True)
 
     build_object(result)
 
@@ -505,8 +505,8 @@ Similar to :py:meth:`Workplane.hole` , these functions operate on a list of poin
 
 .. cq_plot::
 
-    result = cq.Workplane(cq.Plane.XY()).box(4,2,0.5).faces(">Z").workplane().rect(3.5,1.5,forConstruction=True)\
-    .vertices().cboreHole(0.125, 0.25,0.125,depth=None)
+    result = cq.Workplane(cq.Plane.XY()).box(4,2, 0.5).faces(">Z").workplane().rect(3.5, 1.5, forConstruction=True)\
+    .vertices().cboreHole(0.125, 0.25, 0.125, depth=None)
 
     build_object(result)
 
@@ -533,7 +533,7 @@ Here we fillet all of the edges of a simple plate.
 
 .. cq_plot::
 
-    result = cq.Workplane("XY" ).box(3,3,0.5).edges("|Z").fillet(0.125)
+    result = cq.Workplane("XY" ).box(3, 3, 0.5).edges("|Z").fillet(0.125)
     build_object(result)
 
 .. topic:: Api References
@@ -554,12 +554,12 @@ with just a few lines of code.
 
 .. cq_plot::
 
-        (length,height,bearing_diam, thickness,padding) = ( 30.0,40.0,22.0,10.0,8.0)
+        (length,height,bearing_diam, thickness,padding) = ( 30.0, 40.0, 22.0, 10.0, 8.0)
 
         result = cq.Workplane("XY").box(length,height,thickness).faces(">Z").workplane().hole(bearing_diam) \
                 .faces(">Z").workplane() \
                 .rect(length-padding,height-padding,forConstruction=True) \
-                .vertices().cboreHole(2.4,4.4,2.1)
+                .vertices().cboreHole(2.4, 4.4, 2.1)
 
         build_object(result)
 
@@ -604,12 +604,12 @@ ones at 13 lines, but that's very short compared to the pythonOCC version, which
 
 .. cq_plot::
 
-    (L,w,t) = (20.0,6.0,3.0)
+    (L,w,t) = (20.0, 6.0, 3.0)
     s = cq.Workplane("XY")
 
     #draw half the profile of the bottle and extrude it
-    p = s.center(-L/2.0,0).vLine(w/2.0) \
-        .threePointArc((L/2.0, w/2.0 + t),(L,w/2.0)).vLine(-w/2.0) \
+    p = s.center(-L/2.0, 0).vLine(w/2.0) \
+        .threePointArc((L/2.0, w/2.0 + t),(L, w/2.0)).vLine(-w/2.0) \
         .mirrorX().extrude(30.0,True)
 
     #make the neck
diff --git a/doc/fileformat.rst b/doc/fileformat.rst
index b95f173..e34afa5 100644
--- a/doc/fileformat.rst
+++ b/doc/fileformat.rst
@@ -7,17 +7,16 @@ CadQuery scripts are pure python scripts, that may follow a few conventions.
 
 If you are using cadquery as a library, there are no constraints.
 
-If you are using cadquery scripts inside of a caduquer execution environment,
+If you are using cadquery scripts inside of a cadquery execution environment,
 like `The CadQuery Freecad Module <https://github.com/jmwright/cadquery-freecad-module>`_ or
 `parametricParts.com <https://www.parametricparts.com>`_, there are a few conventions you need to be aware of:
 
   * cadquery is already imported as 'cq'
   * to return an object to the container, you need to call the build_object() method.
 
-See the
 Each script generally has three sections:
 
- * Variable Assignments
+ * Variable Assignments and metadata definitions
  * cadquery and other python code
  * object exports, via the export_object() function
 
diff --git a/doc/installation.rst b/doc/installation.rst
index b623756..8633a9d 100644
--- a/doc/installation.rst
+++ b/doc/installation.rst
@@ -42,16 +42,21 @@ Adding a Nicer GUI via the cadquery-freecad-module
 --------------------------------------------------------
 
 If you prefer to have a GUI available, your best option is to use
-the `The CadQuery Freecad Module <https://github.com/jmwright/cadquery-freecad-module>`_.
+`The CadQuery Freecad Module <https://github.com/jmwright/cadquery-freecad-module>`_.
 
 Simply extract cadquery-freecad-module into your FreeCAD installation. You'll end up
 with a cadquery workbench that allows you to interactively run scripts, and then see the results in the FreeCAD GUI
 
+If you are using Ubuntu, you can also install it via this ppa:
+
+https://code.launchpad.net/~freecad-community/+archive/ubuntu/ppa/+packages
+
+
 Zero Step  Install
 -------------------------------------------------
 
 If you would like to use cadquery with no installation all, you can
-use `ParametricParts.com <https://www.parametricparts.com>`_, a web-based platform that runs cadQuery scripts
+use `ParametricParts.com <https://www.parametricparts.com>`_, a web-based platform that runs cadquery scripts
 
 It is free, and allows running and viewing cadquery scripts in your web browser or mobile phone
 
diff --git a/doc/quickstart.rst b/doc/quickstart.rst
index b046139..6701942 100644
--- a/doc/quickstart.rst
+++ b/doc/quickstart.rst
@@ -161,7 +161,7 @@ There is quite a bit going on here, so lets break it down a bit.
 
 **Line 5** creates a new padding parameter that decides how far the holes are from the edges of the plate.
 
-**Line 10** selects the top-most face of the block, and creates a workplane on the top that face, which we'll use to
+**Line 10** selects the top-most face of the block, and creates a workplane on the top of that face, which we'll use to
 define the centers of the holes in the corners.
 
 There are a couple of things to note about this line:
diff --git a/doc/selectors.rst b/doc/selectors.rst
index 0a7ac10..b14a02a 100644
--- a/doc/selectors.rst
+++ b/doc/selectors.rst
@@ -25,6 +25,29 @@ string patterns in, CadQuery will automatically use the associated selector obje
     See :ref:`extending` to see how.
 
 
+Combining Selectors
+==========================
+
+Selectors can be combined arithmetically and logically, so that it is possible to do intersection, union, and other
+combinations.  For example::
+
+    box = cadquery.Workplane("XY").box(10,10,10)
+
+    s = selectors.StringSyntaxSelector
+
+    ### select all edges on right and left faces
+    #box = box.edges((s("|Z") + s("|Y"))).fillet(1)
+
+    ### select all edges on top and bottom
+    #box = box.edges(-s("|Z")).fillet(1)
+    #box = box.edges(s('|X')+s('Y')).fillet(1)
+    box = box.faces(s('>Z')+s('<Z')).fillet(1)
+
+
+or for another example::
+
+    # select diagonal edges
+    box = box.faces(s('>Z')+s('<Z')).edges(-s('|X')-s('Y')).fillet(1)
 
 .. _filteringfaces: