Add debugging, stop hang in ProcessInThread. #139
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Had a few problems getting things going with mdk - this fixes them.
Added a little debugging (which should only show when debug is configured anyway) to make it clearer what's going on.
2 problems fixed:
if something is already listening on the port selenium wants to use, selenium dies immediately. This caused an exception when trying to kill a nonexistent process.
hung in "while True" loop. Which is unnecessary & inefficient anyway. proc.poll() check was incorrect (should have checked for "is not None"), but using communicate() is simpler, easier to read, more efficient etc. anyway.