Solves #138.
* Removed user and user_roles from fixture
* Restricted user creation to one user. That user is id 1, is admin
* Changed tests so they accommodate for this fact
* Can not create new user (fails on test, flashes on signup)
Add a `grunt nightly` build task that copies needed files to a build
folder, then zips them up for distribution. We can also add a tag and
push it to github but I've only tested it with throwaway branches.
I made some guesses about the build folder and dist folder. If you
have a better way feel free to give some recommendations.
Related to #102.
