Set to true to round the `rzSliderModel` and `rzSliderHigh` to the slider range even when modified from outside the slider. When set to false, if the model values are modified from outside the slider, they are not rounded but they are still rendered properly on the slider.

Closes #208.

Also refactor the tests architecture to have real tests interacting from outside the directive.

The order of watchers definition set the order in which their callback will be called when 2 watched
values are modified simultaneously. If the slider value is changed along with the precision options,
we want the value to be parsed with the new precision.

Closes #207

Add a draggableRangeOnly options. 

As described in #196 and #199

The URL has changed as they repository has been moved to its own organisation.

Add keyboard support [WIP]

 # remove jquery

Add a getSelectionBarColor options