Google Maps introduced

The Google Maps API has been implemented and a map is brought up when
"find a shop" is pressed. There is a current marker on the map for
Dundee. The map also shows your current location. Many changes have been
made to the manifest and activities.
Dundee locations

All 9 Dundee Tescos hard-coded into the program. Also including the 2
Broughty Ferry branches.
Merge with Map branch

Merging with Map branch, to include fully functional Google Map
activity.