Fix error message text

[lvitaly]

Is it right error message "LiftCometSupport was not initialized! You must call LiftCometSupport.init() in boot in order to use LiftCometTransportType." for not initialized LiftCometTransportType?

https://github.com/nafg/reactive/blob/v0.4.0/reactive-web-lift/src/main/scala/reactive/web/lift/LiftCometTransportType.scala

[nafg]

Great catch! As you probably suspect, it should say "LiftCometTransportType." I guess that was its original name way back while 18b49c6 was taking shape. Apparently it was committed with the wrong name then.
PR welcome, if you wish ;)