Load user keymaps after packages

This allows user keymaps to override the default
bindings provided by packages.

Refs #261

src/app/config.coffee

@@ -34,6 +34,7 @@ class Config
     @requireUserInitScript()
     atom.loadThemes()
     atom.loadPackages()
+    keymap.loadUserKeymaps()
 
   loadUserConfig: ->
     if fs.exists(@configFilePath)

src/app/window.coffee

@@ -63,7 +63,6 @@ windowAdditions =
     @keymap = new Keymap()
     @keymap.bindDefaultKeys()
     @keymap.loadBundledKeymaps()
-    @keymap.loadUserKeymaps()
 
     @_handleKeyEvent = (e) => @keymap.handleKeyEvent(e)
     $(document).on 'keydown', @_handleKeyEvent