Fixes #670.
Merge pull request #673 from kwhatmough/next

Fixes #670.
Minor whitespace change for appearances. No effect on functionality.
Fixes #671: Implements missing Matrix methods for billboard and reflection.
Merge pull request #674 from kwhatmough/next

Fixes #671 (Matrix createBillboard and createReflection)
Fixes #619.
Merge pull request #676 from kwhatmough/next

Fixes #619.
Added an image to the main README.md
Update README.md
Merge pull request #677 from dgough/next

Added an image to the README.md
Updated the git ignore list
Ignore /usb and /gameplay/windows
Merge pull request #678 from dgough/next

Updated the git ignore list
Ensures physics collision objects are not calling translate(0,0,0) on Nodes and causing them to unnecessarily dirty the transformation if there is no translation to be applied.
Merge pull request #679 from seanpaultaylor/next

Next
Fixed normal vector generation and transformation for terrain.
Completed Terrain::getHeight() and fixed PhysicsRigidBody::getHeight().
Merge branch 'next' of https://github.com/blackberry/GamePlay into next