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

[ProLoser]

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.

[dimirc]

Yes, better. Also I was thinking of losing dependency to ui-utils/ui-keypress and we can simplify template and just do the bindings to these methods at the directive's link fn.

[ProLoser]

Depends on what version you're aiming to support, but I've got no problem with that.

[dimirc]

Removed dependency to ui-utils/ui-keypress. Changes at 63889f6