Don't rezoom when the app is chilling

Attempts to solve the issue of when to reposition the map to track the user's current location by manipulating the existing flags:

* MapFragment.followMe
* MapzenApplication.moveMapLocation

There is a larger refactor here that we can attempt if this solution proves inadequate or at some later time:

* Remove duplicate followMe and moveMapLocation flags.
* Move FindMeReceiver into MapController.
* Add logic to MapController to decide whether to reposition the map on location update.
Merge pull request #288 from mapzen/chuck/dont-rezoom-while-app-is-chilling

Don't rezoom when the app is chilling
Prevents NPEs due to null instructions
Set BaseActivity launch mode to singleTask
Fixes spelling of NotificationBroadcastReceiver
Add some NPE protection to RouteFragment and RouteAdapter
Handle exit navigation intent via onNewIntent()
Removes unused field
Removes unused import
Pops fragments in onPostResume() to avoid IllegalStateException

http://www.androiddesignpatterns.com/2013/08/fragment-transaction-commit-state-loss.html