Collect scope methods such as $scope.up() and $scope.down() into 1 object

To prevent cluttering the `$scope` and accidentally conflicting with user-specified `$scope` data, I recommend we namespace all the scope methods and values.

For instance, instead of doing `$scope.up()` we should probably use a `$select` namespace and do `$scope.$select.up()`, and so forth along this pattern. This `$select` object can also then be used to hold the state of the widget.
