Build: Add load-grunt-tasks

Closes gh-527
License: Update copyright year

Closes gh-526
Grunt: test coverage with Istanbul and Coveralls

As in the jQuery Mobile repo, I'm using grunt-coveralls package
on NPM to send the coverage reports to Coveralls.io

I have tested the same Coveralls integration in a repo of mine:
leobalter/DexterJS#2c27421a
Gruntfile: whitespace