Update .xcodeproj file for Texture Cube.
Fix semantic issue in Xcode: Use of undeclared identifier 'itoa'.
Fix: unable to load shader cubemap.vert.
Update gitignore file for Xcode.
Merge pull request #28 from kitnew/helpful-additions-textureCube

Fixed issues with XCode so it runs on iOS 7.0 and tested on Android 4.1.2