Merge pull request #47 from bvssvni/master

Removed gfx_cube and gfx_triangle
Merge pull request #48 from bvssvni/master

Removed gfx_cube and gfx_triangle from Travis CI
Merge pull request #49 from bvssvni/master

Added paint example
Merge pull request #50 from bvssvni/master

Added paint to Travis CI
Added gfx_cube back in

Closes https://github.com/PistonDevelopers/piston-examples/issues/51