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. 👍 