0.19

• Add ability to share one's position or a location by sending
  sms, email, etc. with properly formatted links with coordinates
  (see the main menu and point of interest bubbles)
• Begin navigating (turn on auto-center, zoom to current position)
  by tapping on the maneuver icon of the navigation statusbar
• Hide POI bubbles by tapping on the label part
• Animate position and bearing changes
• Add Mapbox Streets basemaps (both normal size and retina)
• Add Mapbox Emerald basemaps (both normal size and retina)
• Change default basemap for new users to Mapbox Streets
• Keep positioning on for three minutes if Poor Maps has been
  minimized and cover is not active, but there's no GPS lock yet
• Check that downloaded tiles are actually images
• Fix tiles partially overlapping navigation cover
• Rename and rearrange some menu items