Attempted to solve multi user. Got it to run, but can not log in with
multiple accounts. ToJson is not implemented.
Merge branch 'master' of
https://github.com/markoboger/de.htwg.wt.sudoku.git

Conflicts:
	de.htwg.wt.sudoku/.classpath
	de.htwg.wt.sudoku/lib/de.htwg.se.sudoku.jar