Add bower.json for... well, Bower!

This should be all that is needed to make this available via Bower. Well, this and you can of course register it via `bower register angucomplete https://github.com/darylrowland/angucomplete.git`.

Also, I made this version 1.0.0, as it is used in production, and to give folks some hope of being able to leverage Semantic Versioning. I've also added the `example` directory to the `ignore` list since folks installing via Bower won't want/need those files.