READ ME Google Map Fix

This replaces the MapView in VenueDetails with SupportMapFragment (which
should work on versions earlier than version 11 (3.0 - honeycomb),
unlike MapFragment)

NEED TO READ: This relies on an extra (Google) project being present in
the solution during compilation. Unfortunately, this cannot be added
using GitHub, so it is necessary to follow steps 1-3 at
https://blog-emildesign.rhcloud.com/?p=435 to link the project. The
project should already be present on your computer if you were able to
compile before this change.