#16 Obfuscate email addresses

[John Dvorak]

Remove email addresses from game interface. Replace
existing email links with form for sending messages to
other players. Possible eventual solution of allowing
game "mailboxes" for handling all communications.

Two main reasons to accomplish this:

1. Allow anonymous play
2. Remove addresses for harvesters

Until forms are generated and server email integration
completed, we can do this in phases:

1. Obscure email addresses from anyone *not* logged in
2. Obscure email addresses from anyone *not* logged in
and *not* playing in that particular game
3. Replace email option with a form and allow only for
members of the game who are logged in.

[John Dvorak]

Logged In: YES
user_id=921131

I added code to handle first phase:

Email addresses are now hidden unless users are logged in
(can be logged in for any game at this time).