Merge pull request #1033 from patrickmeehan/develop

fixed xcode compile error
Merge pull request #1034 from patrickmeehan/develop

fixed ZLBitBuffer::GetMask () to work in 32-bit builds
fix ZLPixel not declared
fix build cmake expat
fixed ZLBitBuffer::GetMask () to work in 32-bit builds
Merge pull request #1035 from daltomi/updevel

Fix build.
Merge branch 'develop' of https://github.com/moai/moai-dev into develop
reenabled and fixed webp