removes toast from login screen

- Removes toast from login screen
- Kills bug that crashed app when find me button was clicked when the gps was off. 
Why would this not be a part of findMe method? instead of the a wrapper?

Like here where the call to getLocation happens:
https://github.com/mapzen/mapzen-android-demo/blob/peter/noMoToast/src/main/java/com/mapzen/fragment/MapFragment.java#L245