chore(validate-commit-msg): make commit msg validation suck less

This was a pain in the ass for a while now ^_^

Closes #29
chore(package.json): upgrade `grunt-contrib-concat` to v0.4.0
chore(package.json): upgrade `grunt-contrib-jshint` to v0.10.0
chore(package.json): upgrade `grunt-contrib-watch` to v0.6.1
chore(package.json): upgrade `grunt-karma` to v0.8.2