Add multi polygon class, private methods to polygon.
Merge remote-tracking branch 'upstream/master'

Conflicts:
	Terraformer.xcodeproj/project.pbxproj
Polygon equality helper methods.
Point within polygon test passes!
Merge remote-tracking branch 'upstream/master'
Fix build warning.
Test polygon with hole.
Add comments to the containsPoint: method.
Merge pull request #16 from mbcharbonneau/master

Check if a point is within a polygon, helper methods.