added a ThumbRespeakFragment that has a seekbar that corresponds to the thumb respeaking.
Merge branch 'thumb-respeaking'
Implemented a MenuBehaviour class and in the progress of using it to describe how to deal with the menu bar in each activity.
finished off the menu item navigation functionality in the activities.
All activities inherit from either AikumaActivity or AikumaListActivity which uses MenuBehaviour to implement the inter-activity transitions. Activities can optionally flag safeActivityTransition as true if they need to warn user about discarding data on an activity ransition.