This adds a more generic "add www. to all hostnames" ruleset.

It also makes the existing rulesets in this section work both in the
main configuration file and in .htaccess files, by making the leading
slash optional - ie ^/?


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@685411 13f79535-47bb-0310-9956-ffa450edef68