Added user registration form. (Prototype)

Now admin can register a user when in user management. Only a prototype so far.
Added user registration form. (Alpha)

User registration almost completed - user doesn't get stored in database and duplicates aren't detected.. connection string problem?
No more serializable EntityManagerFactory error?

So far it appears that the error was "solved" by removing <source path=’server’/> in file “DScrum.gwt.xml”.