added draw_overlay method to coordinate_cross.
fixed command line option output.
move gl_assert of glapi below opengl_api call
overload streaming operators for quat
Merge pull request #2 from bernstein/master

add quat_stream_io and fix bug in context.cpp
- added comparison for quat
Merge pull request #3 from scholli/master

- added comparison for quat
- added cmake compiler support for vc2013
Merge pull request #4 from scholli/master

- added cmake compiler support for vc2013
Fixed Volume Loader
CMake Changes from Scholli
Small Debug assert fix
Merge branch 'master' of https://github.com/chrislu/schism

Conflicts:
	build/cmake/custom_scripts/schism_compiler.cmake
	scm_gl_core/src/scm/gl_core/render_device/context.cpp
Merge branch 'master' of https://github.com/gandideluxe/schism

Conflicts:
	scm_gl_core/src/scm/gl_core/render_device/context.cpp