The analyzer is now found in analyzer.py and uses the '-f' flag for
GZIPed input files. Bundled with the previous PR commit, this update
should now be clearer.
Updated the README to reference NetFlow v1 and v5 as well.
The fallback(key, dict) method used an exception-based testing of the
keys existence. Switched to 'if x in'.
The NetFlowListener is based on threading.Thread, which uses the
'timeout' parameter in .join(). Added.