http, socket_io_clients(), add socket io configuration options:
 - no_minification: (Bolean) do not minify socket io client

 - no_etag        : (Bolean) do not generate etags for socket io client

 - no_gzip        : (Bolean) do not gzip socket io client

 - transports: (Array) defaults to [ 'websocket' ] where each item is a transport
     name string, supported transports are:
       - 'websocket'
       - 'flashsocket'
       - 'htmlfile'
       - 'xhr-polling'
       - 'jsonp-polling'

     Check socket.io documentation for more details about these transports.