Added Mocha unit testing to the grunt task.

* Added Mocha unit testing, run on files in the ./test directory.
Merge branch 'calcFix' into travisMocha

Conflicts:
	modules/calc.js
Added some tests for calc, example and greeting modules.
Merge branch 'master' into travisMocha
Quickfix for jsHint of lastseen.js
Merge pull request #57 from verath/travisMocha

Travis mocha unit testing