Fix FindLua52.cmake license text
Actually include the Lua include directory
Add check for GLM installation on non-Win32 systems

Thanks to Jussi Lind for pointing this out.
Fix LuaState error handling
Allow creation of additional shared graphics contexts

Can be used to multi-thread OpenGL stuff.
Fix build for Ubuntu 13.10
Handle 32-bit/64-bit SDL and GLEW linkage
Replace LuaScript class with just script files
Replace Lua includes in headers with forward declarations
Link statically to GCC on Windows