make read() fail with TwistedConnector
VRTClient with callback for packets arriving
vrt_callback: pass through from TwistedConnector -> VRTClientFactory -> VRTClient
update gui for TwistedConnector changes
remove twisted_util (no longer used)
update twisted_show_i_q example
Merge pull request #15 from wardi/vrt-callback

TwistedConnector: use simpler, more general callback approach for when VRT data arrivals