Added a return statement that was needed to make rotateAboutCenter work properly.

cadquery/CQ.py

@@ -678,7 +678,7 @@ class CQ(object):
         def _rot(obj):
             startPt = obj.Center()
             endPt = startPt + endVec
-            obj.rotate(startPt,endPt,angleDegrees)
+            return obj.rotate(startPt,endPt,angleDegrees)
 
         return self.each(_rot, False)
 
@@ -1437,7 +1437,6 @@ class Workplane(CQ):
             else:
                 r = callBackFunction(obj)
 
-
             if type(r) == Wire:
                 if not r.forConstruction:
                     self._addPendingWire(r)