Switch to david-dm.org for the dependencies.
Update README.md.

Fix code syntax and break a couple of long lines.
Explicitly set the files when installing via npm.
Normalize package.json.
Tweak JSHint options and fix the warnings.
Update dependencies.

Also, remove underscore from `devDependencies` since it's in `dependencies`.
Add time-grunt so that we see the time spent in Grunt tasks.
Gruntfile.js: simplify tasks.
Gruntfile.js: Fix connect task.
Gruntfile.js: add the script itself in watch task.
Merge pull request #52 from XhmikosR/master

Minor improvements
Merge branch 'master' of https://github.com/addyosmani/grunt-uncss into add-report

Conflicts:
	README.md
	package.json
	tasks/uncss.js