Log Message:
Update www/squid27 package to 2.7.6(2.7.STABLE6).

Changes to squid-2.7.STABLE6 (4 February 2009)
	- Bug #2494: Fix tproxy url in configure
	- Correct latency measurements
	- Correct upgrade_http0.9 example
	- Correct parsing of invalid http version numbers
	- Crossreference authenticate_ip_shortcircuit_access and
	  authenticate_ip_shortcircuit_ttl
	- Add in some better documentation for override-expire.