Fix bug where you couldn't use backspace, delete, arrow keys in file finder.

Bind all these movement keys only to editor for now, because they're interfering with the default input behavior.

src/atom/editor.coffee

@@ -50,7 +50,7 @@ class Editor extends View
     @autoIndent = true
 
   bindKeys: ->
-    window.keymap.bindKeys '*:not(.editor *)',
+    window.keymap.bindKeys '.editor',
       'meta-s': 'save'
       right: 'move-right'
       left: 'move-left'