Merge pull request #21 from marcusva/master

Do not use SDL_free() on C.CString() items
Merge pull request #22 from marcusva/master

Wrapped parts of SDL_hints.h
changed a little bit of api
Merge pull request #24 from krux02/master

changed a little bit of api
- Added tests for Init(), WasInit(), InitSubSystem() and QuitSubSystem()
- Added wrappers for SDL_GetBasePath() and SDL_GetPrefPath()
- Added tests for GetCPUCount(), GetCPUCacheLineSize() and GetSystemRAM()
removed superfluous test wrappers