Removed debug functionality from CityGenerator.

We have the city being built in a Unity scene, so there
is no need for the debug PNG anymore.
Randomly remove roads and park fix.

Fixed bug in park where it could overwrite part of the map edge.
Some roads are randomly removed from the map to add a little
diversity to it. It should remove from one veritcal and one horizontal
to half the roads (of each type).
Merge branch 'master' of github.com:TCalvert93/Pointer

Conflicts:
	Assets/CityTexture.png