build.sh: added embedding of javascript into the index.html.
Added externs.js, added the inclusion in build.sh of it.
Added "before release" section into todo.
index.html: added game description and styles.
server.js: removed unused socket_partners[].
server.js: added emit2() and emit2_partner() with logging, updated code to use them.
server.js: changed debug log formatting.
server.js: fixed missing parameter in "ping_response".
Added pause on "game_disconnected".
Updated todo.
server.js: removed mistakenly commited logging.