Enable Simple signup

This is just a very simple user creation addition.
There is now a link on the default page to take you to signup.
I posted my questions throughout the code.

@melari, signup works, but I created this PR mainly to get some feedback.
Well, I could make a button with HTML if I wanted to, but I'm sure there's a more "rails" method of linking to another view, but I don't know what it is.