feat($goQuery): Experimental integration of Query 

$goQuery is a service built on `key.query()`.  It accepts a key, room,
filter and options.  It returns a QueryModel. The Model has the standard
`$sync` method which keeps the models value current with that of the
query result set.

```js
angular.module('ChatApp').controller('ChatCtrl', ['$scope', '$goQuery', function($scope, $query) {
  var filter = { sender: { '$eq': 'GrandMasterLivingston' }};
  var sort = { $name: 'desc' };
  var limit = 20;
  var options = { sort: sort, limit: limit };

  $scope.chat = $query('messages', filter, options);
  $scope.chat.$sync();
}]);
```

Related: #48