Added SaveRenderTarget to Game.cpp
this fixed #41
Updated includes
Added transparency support
Removed SaveRenderTargetToPNG from Game
Created Texture2D::SaveToPNG
Updated include
Merge branch 'develop' into feature/texture2DSaveToFile

Conflicts:
	include/MINX/Game.h
	src/Game.h
Merge pull request #53 from GearChicken/feature/texture2DSaveToFile

Feature/texture2D save to file