Merge pull request #8 from bvssvni/master

Some cleanup
Update due to PistonDevelopers/image changes
Merge pull request #11 from PistonDevelopers/update-to-genericimage

Update due to PistonDevelopers/image changes
Added metadata, upgraded to latest piston-image
Merge branch 'master' of https://github.com/bvssvni/select_color