remove an unnecessary TODO
some minor modification, upload to http://www.testin.cn to test for capability.
 - remove KTX texture loading
 - add signal handler on SIGSEGV
 - add SDL_GL_DeleteContext and SDL_DestroyWindow at the end of the "main" function
Merge branch 'test2' of https://github.com/eastcowboy2002/gles-study into test2

Conflicts:
	glesstudy/jni/main/main.cpp