enable c++11, replaced sonme older boost stuff with c++11 equivalent
Removed the OpenGLe backend.
The OpenGL backend supports the same features, so no reason to keep it around. fixes #822
Merge branch 'master' of https://github.com/fifengine/fifengine

Conflicts:
	engine/core/gui/fifechan/base/opengle/opengle_gui_graphics.h