Tighten the tick loop

In the past, we consumed from the event queue until we were idle for a certain
amount of time (0.1s). This would cause hangs in interactive tools when there
was a stream of events, hurting responsiveness. We now wait for a maximum of
0.1s before triggering the tick loop, will be able to reduce this further down
the track.

mitmproxy/controller.py

@@ -110,9 +110,6 @@ class Master(object):
     def tick(self, timeout):
         changed = False
         try:
-            # This endless loop runs until the 'Queue.Empty'
-            # exception is thrown.
-            while True:
             mtype, obj = self.event_queue.get(timeout=timeout)
             if mtype not in Events:
                 raise exceptions.ControlException("Unknown event %s" % repr(mtype))