Removed Devise, added basic authentication

Here is what I did:

I created a migration to get rid of the fields that Devise left behind. I also got rid of the Devise files.
The basic authentication is there. Data sets, sources, and tags can not be modified or destroyed by non-users. It will just redirect you to the login page.

One caveat: If you login with the wrong password, it will give you a 'template missing' error instead of returning you to the login page. I cannot figure out how to display the error in the view using form_tag .

I know we talked about users only being able to delete their data sets, sources, and tags and not others', but I would rather set up Rspec and get some tests up before I tackle those issues.
A silly word game:

"**Sign** Up" but "**Log** in" and "**Log** out"? What does "log in/out" mean? Do any of these things mean anything outside of internet culture?

A coworker asked me, when I was brand new at all of this, if I thought "sign in" or "log in" was better. I had never thought about it, but then decided maybe "sign in" was. It seemed like he agreed. I've sort of wondered since whether anyone else in the world even cares.

Nothing to do here, unless my rambling has given you some epiphany on the subject. If so, please share! :dolphin: :sparkles: