queue up messages to be sent when we actually connect with MXHR. if using IE8/mxhr, on_connect gets called before 'new Hippie()' returns, breaking sending events on connect
allow generic event handlers for hippie.pipe
make generic message handler message.*, more consistant
more tolerent JSON encoding - don't silently fail and explode if we fail to parse the incoming AnyMQ message as JSON
handle non-json data gracefully