changes for compatibility with socket.io 1.0
Merge branch 'master' into socket1
updated client socket.io code
slightly prettier wzin for not adjacent messages
background gradients in /intro
fixed : pen messing with indentation. Some style changes
small superficial changes
removed session.socket.io which wasn't compatible with socket.io 1.0 and replaced it with my own code
no more autocomplete of the message input (for Firefox)
fix of a possible crash cause
recent history of a message is displayed on click on pen
fixed : broken removal of wzin