Refactor the package name for easy access?

As of now, to access the library you need to type in the whole path to the view (which is quite annoying if using the library at multiple places)

`in.championswimmer.libsocialbuttons.fabs.FABFacebook`

I suggest refactoring this to

`lib.social.fab.facebook`

Not a deal breaker but could be a nice tweak.

Let me know if you want a pull request. 👍

Start by locating the FABFacebook class and references to the current in.championswimmer.libsocialbuttons.fabs package. Review how package changes affect the Android library and its consumers; done means the proposed lib.social.fab.facebook path is consistently usable without the old fully qualified path.

Written by the indexing model from the issue text.