added bower support

Adds [bower](http://bower.io/) support to [OwlCarousel](http://owlgraphic.com/owlcarousel/) with only the files needed, plus [README](https://github.com/OwlFonk/OwlCarousel/blob/master/README.md) and [LICENSE (MIT)](https://github.com/OwlFonk/OwlCarousel/blob/master/LICENSE). See the `"ignore"` section, if you think other files should be included/excluded.