adding nav.js
Merge branch 'master' of https://github.com/HejdesGit/eurounicorn

Conflicts:
	frontend/app/scripts/controllers/nav.js
show navbar only when logged in.
Hide Song, Submission when not logged in.
Hide Song, Submission when not logged in.
Merge pull request #12 from HejdesGit/master

Hide song and list when not logged in + Nuget updates.