Store whole lobby in session
Store the whole lobby object in the session so that the names of the
players can easily be displayed.
Updated page to display lobby leader in the lobby details section.
Refactored out lobbymembers section to its own includable jsp.
Prevent creation of duplicate lobbies.
When lobby is set in session, then display lobby details rather than
lobby creation / join buttons.
Refactored out lobby creation / join / return to into a new jsp.
Added member list to lobby.
Updated featurelist.
Reformatted join lobby page
Hid the list of players on join lobby screen
(Doesn't work for now and isn't really *that* important.)