Put initialization of GPS broadcast reception in onStart()

It's removed in onStop() so should be initiated in onStart().
Without this change, if the user left the map and came back, they
would no longer get GPS updates.
Use the service's last location if available and the center hasn't been set in other ways
Update Hindi translation
Update Marathi translation
Merge pull request #734 from vinitraje/master

Update Hindi & Marathi translations (@vinitraje)
Merge pull request #730 from keverets/avoid-ocean

Use the service's last location if available and the center hasn't been set in other ways
Merge pull request #725 from keverets/map-resume

Put initialization of GPS broadcast reception in onStart()
Add icons and text to MapActivity to indicate the GPS fixes & satellites

Icon from https://www.iconfinder.com/icons/175171/gps_receiving_icon so if used
must include link to author's website: http://icons8.com/

Modified icon for the case of no fixes by removing semicircular lines.  Made
white and scaled for xxhdpi, xhdpi, hdpi, and mdpi.
Add latitude & longitude to the header bar
Add Cell and WiFi info to the bottom of the MapView