Merge pull request #2 from colinkho/master

Added server functionality
Added authenticate servlet
fixing conflict from stupid stupid git
Authenticate uses parameter class
Merge pull request #3 from colinkho/master

Implemented Unregister and ChangePassword functionality
Implemented UserManager class and updated DatabaseUtility.
Merging changes
Fixed error with merged code

removed bad parameter in call to fChangeId
Trying to fix servlets