fixes returning to map on click of notification
deregister view updater receiver
Merge pull request #198 from mapzen/peter/notification_fix

fixes returning to map on click of notification
stores average speed to calculate average speeds
make number of locations for calculating average speeds configurable
adds average speed to debug view
splits currentspeed and average speed from the perspective of zoomController
move map according to location not instructions
not override location
inject zoomController