Added user login and user creation servlets.  (Servlets currently do NOT redirect after successful or failed login, have to decide where I want those to go first)
Simple test GUI for logging in.
Added jUnit test to classpath.  This will be mandatory for use moving forward. (That being said, I haven't added any real tests yet.  I need to work out some package confusion issues with the test package.
I really need to figure out a better way to store error message constants.  I like the idea of having them stored in a giant Int,String map, but I don't like the constants being spread out around the packages. . . Maybe just all in the ErrorCode class?