Add support for AboutLibraries

[maresmar]

The AboutLibraries library allows you to easily create an used open source libraries fragment/activity within your app. It looks much better than text and doesn't need much of work for implementation.

I was unable to test it with the original Gradle and build tools (as my Android Studio doesn't support that), but at least with Gradle 3.0.0 it works fine for me. The newer gradle is used for debug version suffix (so you can optimally omit the update).

Reference: https://github.com/mikepenz/AboutLibraries/wiki/HOWTODEV:-Include-in-your-library