Update groc version to avoid underscore breaks
Update dependencies

Major versions:
* grunt-shell
* time-grunt

Minor versions:
* grunt-mocha-cli
v3.3.1

* Update `groc` to version that doesn't fall prey to breaking changes in `underscore` 1.7
* Major version updates: `grunt-shell`, `time-grunt` (strange; these don't seem to introduce breaking changes)
* Minor version updates: `grunt-mocha-cli`