timer implementation

timer implementation

This commit implements the whole timer view, model and presenter
creation procedure due to MVP pattern. The timer is the view that
shows running counter and provides alarm ring after the set time
timeout. The ring alarm is called after the set time and if
countdown was paused and resumed this time is updated. Timer's
view shows the time selector during the edition process and
counter on timer start.

Change-Id: Iba26715081deb7864704a32686e7c3345b75f7a8