Revert "Don't propagate mouseUp events from the toolbar. Fixes #1169"

This reverts commit 28c48518c064b6c0769b43d7ddcdbbe89a169926.

Reverted until @csillag shows me why this is a significant win because
otherwise it is code here that has nothing to do with the toolbar.

h/js/plugin/toolbar.coffee

@@ -21,7 +21,6 @@ class Annotator.Plugin.Toolbar extends Annotator.Plugin
           window.annotator.showFrame()
         else
           window.annotator.hideFrame()
-      "mouseup": (event) -> event.stopPropagation()
     ,
       "title": "Show Annotations"
       "class": "alwaysonhighlights-icon"
@@ -30,7 +29,6 @@ class Annotator.Plugin.Toolbar extends Annotator.Plugin
         event.stopPropagation()
         state = not window.annotator.visibleHighlights
         window.annotator.setVisibleHighlights state
-      "mouseup": (event) -> event.stopPropagation()
     ,
       "title": "Highlighting Mode"
       "class": "highlighter-icon"
@@ -40,7 +38,6 @@ class Annotator.Plugin.Toolbar extends Annotator.Plugin
         state = not (window.annotator.tool is 'highlight')
         tool = if state then 'highlight' else 'comment'
         window.annotator.setTool tool
-      "mouseup": (event) -> event.stopPropagation()
     ,
       "title": "New Comment"
       "class": "commenter-icon"
@@ -48,7 +45,6 @@ class Annotator.Plugin.Toolbar extends Annotator.Plugin
         event.preventDefault()
         event.stopPropagation()
         window.annotator.addComment()
-      "mouseup": (event) -> event.stopPropagation()
     ]
 
   pluginInit: ->
@@ -63,7 +59,6 @@ class Annotator.Plugin.Toolbar extends Annotator.Plugin
       .attr('href', '')
       .attr('title', item.title)
       .on('click', item.click)
-      .on('mouseup', item.mouseup)
       .addClass(item.class)
       button = $('<li></li>').append(anchor)
       buttons.add button