Use data api for options

[mugglmenzel]

Hi
Really a great job you did with Powerange. I like your slide component a lot and use it in a current web app project.

There is few things I am missing, and I think I just add them as "issues".

Please add data api support and/or support for HTML5 attributes. That would make Powerange even simpler to use and minimizes the amount of js/coffeee to be written.

Example:

<input class="powerange" type="text" value="100" min="10" max="150" step="5" data-hide-range="true">