Remove Screen references from Point
Update test
Remove Level from Pathfinder

Only needs grid to work now, this makes it testable
Merge pull request #11 from doug1/test

Update Point constructor to use 0,0 and update test
Fix removal of Level from Pathfinder
Import vendor Google Test 1.7 framework
Merge pull request #12 from doug1/gtest

Import vendor Google Test 1.7 framework
Add google test includes