Prefix game keys in the redis db.
Made some general fixes with data flow.

Updated the templates to allow always passing username for layout.
Updated creation form to have a name on the input elements so they get passed correctly.
Validate a /play/:gameId link is a valid game.
Pull ManfredGame and GameKey out into a separate file
Start keeping track of a set of players.
Added storage capabilities for player handles.
Handle a player missing a handle for the given game.
Merge pull request #2 from natebeck/aaron-general-fixes

General fixes and improvements.