Recording should pause when back button pressed

[mXaln]

Issue #1173 ;

Also audioPlayer seeks to the beginning when it finished playing

[jsarabia]

This would work, but is pretty backwards in my opinion.
The RecordingControls fragment doesn't hold the player or anything like that, it just is an interface for the user to input pause/play commands. Now, there's some extra logic and state here because the buttons have to reflect the state of an audio player, as well as maintain a timer, but it's really not a widget that needs or should care about application lifecycle.

The fragment has a public API for pausing (which you call in your onBackPressed method). Since you already have to call a method on the fragment from the activity; why not just call the pause button directly.