Update npm dependencies to latest version
Improve tests

- Add code coverage
- Use jshint directly instead of grunt-contrib-jshint task
Add travis-slack notification

Also remove before_install task as grunt-cli is no needed anylonger to
run tests.
Restore grunt-cli global installation
Add s3 artifacts deployment
Update README
Add travis-coveralls integration
Improve cmd config fetching

It also improves code coverage :-)
0.1.4