NEW
* Permission priming: show custom views before asking for permissions

FIXED
* Inputs login and signup should remain above keyboard instead of at top of
  screen
* Show map tiles for observation taxon on ObsDetail
* Confirm comment deletion
* Show log in button on MyObs instead of Upload button
* Removed minimum zoom for LocationPicker
* MyObs TabBar icon should remain after signing in but losing network

CHANGED
* Numerous battery usage and performance improvements
