Fix vector assignment in terrain.frag

Apparently some drivers are picky about this.

Fixes #1449
Merge pull request #1450 from rgngl/patch-1

Fix vector assignment in terrain.frag
Merge pull request #1451 from blackberry/master

Merge master to next
Added support for XCode
Merge branch 'next' of github.com:blackberry/GamePlay into twoD-additions