Remove grunt-concurrent

Was mostly just confusing and bugprone to run the devserver and the tasks
in the same tasks, especially if the devserver crashed and you needed to
restart the watch task as well to get it going again.

New solution, just run the devserver in one terminal, and watch in
another.
Remove ntnuita.no as host for devserver
Refactor and make it work under vagrant
Refactor memcached state
Add vagrant pillar state
Update and clarify readme
Deploy using fabric