make the back to top fixed and fluidify the follow scrolls

Fixes #89

assets/scripts/app/tailing.coffee

@@ -45,8 +45,9 @@ $.extend Travis.Tailing.prototype,
     offset = $(window).scrollTop() - $('#log').offset().top
     max = $('#log').height() - $('#tail').height() + 5
     offset = max if offset > max
-    if offset > 0
+
-      tail.css(top: offset - 2)
+    if offset > 0
-    else
+      tail.css(position: 'fixed', right: 32)
-      tail.css(top: 0)
+    else
+      tail.css(position: 'absolute', right: 2)
 

assets/scripts/app/templates/jobs/pre.hbs

@@ -1,7 +1,14 @@
 <div id="log-container">
   <a href="#" id="tail" {{action "toggleTailing" target="view"}}>
     <span class="status"></span>
-    <label>Follow logs</label>
+
+    <label>
+      {{#if view.job.isFinished}}
+        Scroll to end of logs
+      {{else}}
+        Follow logs
+      {{/if}}
+    </label>
   </a>
   <pre id="log" class="ansi"></pre>
 

assets/scripts/app/views/log.coffee

@@ -97,6 +97,7 @@ Travis.reopen
       window.history.pushState({ path: path }, null, path);
       @set('controller.lineNumber', number)
 
+    actions:
       toTop: () ->
         $(window).scrollTop(0)
 

assets/styles/main/log.sass

@@ -86,7 +86,8 @@ pre#log
 #log-container
   position: relative
 
-#log-container #tail
+#log-container
+  #tail
     z-index: 99
     position: absolute
     display: block
@@ -127,3 +128,16 @@ pre#log
 
     &.active .status
       background-color: #6b0
+
+  .to-top
+    position: fixed
+    display: inline-block
+    bottom: 5px
+    right: 35px
+    width: 50px
+    float: right
+    margin-right: 2px
+    padding-right: 16px
+    text-align: right
+    color: #999
+    background: inline-image('ui/to-top.png') no-repeat right 6px

assets/styles/main/sponsors.sass

@@ -3,12 +3,3 @@
     // float: left
     margin-top: 0
     color: #999
-  .to-top
-    display: inline-block
-    width: 50px
-    float: right
-    margin-right: 2px
-    padding-right: 16px
-    text-align: right
-    color: #999
-    background: inline-image('ui/to-top.png') no-repeat right 6px