Work on default theme.
Merge branch 'next' of https://github.com/blackberry/GamePlay into next
Removing unused files.
Merge pull request #1389 from blackberry/next

Next
Use Windows path separators in VC proj files
Merge pull request #1391 from blackberry/master

Merged master to next
Adds middle wheel zooming to ParticlesGame samples
Merge branch 'next' of https://github.com/blackberry/GamePlay into next
Merge pull request #1393 from blackberry/next

Next
Updated Mouse Wheel values on Linux
Merge branch 'master' of https://github.com/blackberry/GamePlay
Merge pull request #1394 from blackberry/master

Next
Fixed Linux mouse wheel scroll.
Merge pull request #1395 from blackberry/next

Next
Updated CHANGES.md
Merge pull request #1396 from blackberry/next

Updated CHANGES.md
More work on default theme.
Merge branch 'next' of https://github.com/blackberry/GamePlay into next
Fixed Form::create so that it returns NULL on error
Merge pull request #1397 from dgough/next

Fixed Form::create so that it returns NULL on error