Merge pull request #53 from bvssvni/master

Added gfx_cube back in
Merge pull request #54 from bvssvni/master

Removed Makefile and build.sh
Merge pull request #55 from bvssvni/master

Added gfx_cube to Travis CI
Update README.md

There are no Makefiles.
Merge pull request #57 from crazymykl/patch-1

Update README.md
Removed hgl_triangle from Travis CI