Run physics in 32-bit.
Merge branch 'develop-v3' into 32-bit-physics
Fixing warnings for 64 bit builds.
More 64 bit fixes.
Avoid conversions when possible.
Merge branch 'develop-v3' into 64-bit
Fixes for running unit tests on 64 bit.
Merge pull request #581 from cocos2d/64-bit

64 bit fixes.