Upgrade to latest ember, cli, etc.

ember 1.11.0-beta.3 fixes a demo-blocking bug. ember-json-api 0.3.0
fixes a bug so we can remove custom serializer code.

ember/app/serializers/application.js

@@ -1,22 +1,4 @@
 import JsonApiSerializer from 'ember-json-api/json-api-serializer';
 
 export default JsonApiSerializer.extend({
-  normalize: function(type, hash, property) {
-    var json = {};
-
-    for (var prop in hash) {
-      json[prop.camelize()] = hash[prop];
-    }
-
-    return this._super(type, json, property);
-  },
-
-  // We can get rid of this after
-  // https://github.com/kurko/ember-json-api/pull/59 is merged.
-  extractMeta: function(store, type, payload) {
-    if (payload && payload.meta) {
-      store.setMetadataFor(type, payload.meta);
-      delete payload.meta;
-    }
-  }
 });