Bunch of library fixes

[thefex]

1. Custom InputToolbar support.
2. Default user initials support.
3. User Send Add Message method is now protected.
4. RecyclerView invalid height (wrap_content) fix
5. RecyclerView is scrolled to bottom when keyboard is opened.
6. Keyboard closed when recyclerview/recyclerview item is tapped.
7. Fixes SchedleTaskExecutor leak.
8. Updated libraries.

Please review commits and their messages.

[felixdivo]

Hello, why isn't this merged?

Theses are only some of the bugs I found while using it ... The library is quite unreliable.