ENH: move signal.signal(signal.SIGHUP, signal.SIG_IGN) before fork in server. closes #446
ENH: add squid filter
BF: multiple _ separated values according to http://wiki.squid-cache.org/SquidFaq/SquidLogs#Squid_result_codes. Thanks Steven
Merge pull request #482 from grooverdan/squid

ENH: add squid filter
Merge pull request #452 from grooverdan/early-sighup-ignore

ENH: move signal.signal(signal.SIGHUP, signal.SIG_IGN) before fork in server