Added Point Class
Created and added integer based point class and appropriate junit tests
Added GameObject Class
Game object is the model class that pretty much everything will be a
subclasss or subsub class of
Added Unit class.

Included some fields, needs methods.
Merge remote-tracking branch 'justin/master'
Added Turret Class that extends Structures and implements canAttack
Added Structures Class which implements Attackable
Merge remote-tracking branch 'Dan/master'
Added Javadocs
Merge remote-tracking branch 'Sam/master'
Merge remote-tracking branch 'Austin/master'
Merged Team Changes
Merged changes created by team. Also corrected a few identifier issues
with Structures and Turrent classes. Also started Interactable class
Changed Structures to Stucture
Added junits
added Turret and Structure test classes, and also fixed the original
classes