Presents a notification when routing
adds routing in the navigation bar and the ability to exit routing in the notification bar
adds routing notification for first instruction
adds test for notification routing
adds test for checking if exiting notifications works
cosmetic fixes
Merge pull request #174 from mapzen/peter/routing_notifications

Peter/routing notifications
introduces RoutePreviewFragment
adds Dagger injection framework
adds route_preview container and view
toggles actionbar when route_preview is added
adds destination and current location text views
adds reverse route button
dealing with merge
add switch button
removes unused import
adds path to route preview
set dynamic zoomlevel based on route previewed
adds walking biking and driving options to route preview
using transportation types from on the route library
formatting attempts
adds a and b marker at beginning and end of route preview path