Fixed some bugs

The users counter is based now in the lenght of the nicknames array

When disconnect, the nickname is deleted from this array.

Added some broadcasts to get updated all the clientes in many events
Many changes

Deleted the flash message for success nick assignation
Fixed a bug which shows a wrong userlist
Implemente de show/hide functionality for the chat window
Enhanced the disconnection feature
Added new globla style
Show/Hide Chat window

added a feature to show/hide the chat block when a nickname is assigned
Moved the header