Update grunt-umd version
Tidy up
Mark Grunt as dev dependency
Use hex code instead of 'black'

If you use the light one-color.js (not one-color-all.js) you can't use named color and colorjoe doesn't work, so just use '#000' instead of 'black'.
Merge pull request #17 from fabiocaseri/patch-1

Use hex code instead of 'black'
Add @fabiocaseri to contributors
Bump version