Preliminary game password support.
Users can join password protected (and password-less) games by scanning a
QR code (or manually typing in a URL).

Game creator clicks QR code button (at bottom of the game window) to
display QR code.
QR code moved into a seperate view.
Implement jsondict (dict) support in mock factory for game tests.
Merge pull request #65 from clach04/passwords

Preliminary game password support and join by scanning QR code