* added premake file and script (windows and linux support wip)
 * added gl_support class (initializes opengl function pointers on all non-apple platforms; note: tries to initialize pointers in core->ARB->EXT order)
 * use opengl 2.1 for debugging/testing purposes for now
 * restored building against opencl 1.1 headers/lib
 * added install script (for windows/mingw and linux/unix)