chore(build): Use grunt-usemin and grunt-rev to concatinate CSS and rev files.

fixes #30
chore(build): Use grunt-connect-fonts to pre-generate fonts CSS.

fixes #30
fix(test): Fix the missing 'static_dir' setting when running the tests
Merge pull request #37 from shane-tomlinson/issue-30-concatinate-css

chore(build): Use grunt-usemin, grunt-rev, and grunt-connect-fonts to concatinate/rev CSS files.