Only show events w/ descriptions in EventPalette

Also, auto-generate human readable event name in editor. This is a good example of how we could do this automatically for some kind of `onCommand`, `command`, `onInteractiveEvent` method that combines the event name, documentation string, and handler in one shot.

src/app/editor.coffee

@@ -155,10 +155,14 @@ class Editor extends View
         'editor:toggle-line-comments': @toggleLineCommentsInSelection
         'editor:log-cursor-scope': @logCursorScope
 
+    documentation = {}
     for name, method of editorBindings
+      documentation[name] = _.humanizeEventName(name)
       do (name, method) =>
         @on name, => method.call(this); false
 
+    @document(documentation)
+
   getCursor: (index) -> @activeEditSession.getCursor(index)
   getCursors: -> @activeEditSession.getCursors()
   getLastCursor: -> @activeEditSession.getLastCursor()