Fix function signature to return data type as exposed API. Fixes #195.
Increased the OpenGL ES constant depth bias adjustment to reduce self-shadowing artifacts. Do not use cascaded shadow mapping on OpenGL ES, so that the low quality shadow mode can avoid dependent texture reads altogether for much higher performance on iOS. Updated documentation of the GetPlatform() function.
Better integration of MinGW cross-compiling build process.

- Runtime and archive output directories change to mingw-Bin and mingw-Lib, respectively.
- Enable SCP_TO_TARGET build option for all cross-compiling build process (except Android).
- Enable LuaJIT support for MinGW cross-compiling build.
- Cache MinGW toolchain path and sysroot.
- Fix "object file is too big" issue when building Assimp library in debug build using MinGW.
- Reorder the build processes documentation section to match the Readme.txt file.
Cleanup build script - support SCP_TO_TARGET build option consistently.
Web-sync at 2014-02-15 14:47:07 +0800.