Merge pull request #303 from gena-m/master

fixed friction
fixed b2Distance
Merge pull request #304 from gena-m/master

added memory and GC state labels
fixed test compilation
Update AssemblyInfo.cs description
Add box2d tests to fix compile errors
Merge pull request #305 from mono/master

Update AssemblyInfo.cs description
removed files that we don't use or need.
changed tests to use update() instead of their own tick
Merge pull request #308 from denis-minchuk/master

b2CircleShape RayCast fix, Collision filter fix, fix in RayCast and EdgeShapes tests
Merge pull request #306 from Cocos2DXNA/TESTS_USE_SCHEDULEUPDATE

changed tests to use update() instead of their own tick