Feature to add bootstrap tabs

Hey phiamo, 

   Let me know what you think about this idea... It's working for the most part right now but I would still like to go through it with a fine tooth comb. I just don't want to do too much more work on it until I know it would be something you'd be interested in adding. I could possibly make my own bundle with the tabs stuff but I think it would be much easier to integrate it into this so that the views would work properly. 

I plan on making some of the options global, like the tabs ul classes, etc. I've also added some documentation for it as well so take a look at that. I wanted to make this an "issue" but I'm not sure how to associate it to this diff. Let me know if I should do it a different way - And again, don't merge this quite yet unless you think it's satisfactory and I can just make another pull request for further changes.