Native open code now presents the open panel from the browser process

This avoids retina resolution issues and ink framework errors that occur when opening dialogs from the chromium renderer process.

src/app/keymap.coffee

@@ -21,9 +21,7 @@ class Keymap
 
     $(document).on 'new-window', => $native.newWindow()
     $(document).on 'open-user-configuration', => atom.open(atom.configFilePath)
-    $(document).on 'open', =>
-      path = $native.openDialog()
-      atom.open(path) if path
+    $(document).on 'open', => atom.open()
 
   bindKeys: (selector, bindings) ->
     index = @bindingSets.length