Move `grunt-lib-contrib` to `dependencies` since it's needed there.
Revert the `load-grunt-tasks` update to support node v0.8 again.

Also, the remaining updates break node 0.8 support too.
Update .travis.yml.
Add `jshint` target in `test`.
Use one var scheme more consistently.
Clean up Gruntfile.js.
Remove `eqnull` from jshintrc.
Merge pull request #70 from XhmikosR/master

Move `grunt-lib-contrib` to `dependencies` plus a few minor tweaks.