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.
I've always wondered about this too. "Log" makes sense to me because it's like you're signing a log (to a database anyway...). In general I prefer "Sign In/Up", however my only argument for using both "Sign Up" and "Log In" is that when you have the two next to each other, it's easier for people to differentiate between the two to quickly figure out which one the want.