Fixes an issue where data was double-wrapped when using SocketAdapter

Resolves: https://github.com/bmac/ember-data-sails-adapter/issues/35

I wasn't able to get the qunit tests running because of duelling versions in bower (jQuery 2.1.1 vs Ember 1.7 vs Ember-Data 1.0.0-beta12).

I tested it in a live sails instance running Ember 1.9.0-beta.1 and it seemed to. worked great.