rpearce: Fixing support for Debian/Ubuntu.

Bug fixed in params.pp s/default_package_name/package_name/
Corrected package name for Debian/Ubuntu (squid3)
Added a config_file param due to support Debian/Ubuntu (/etc/squid3/squid.conf)
Added path to service to support Debian/Ubuntu (/usr/sbin/service)
Merge pull request #2 from rjpearce/master

rpearce: Fixing support for Debian/Ubuntu.