Fix for bug 95890: Correctly convert/record keyword changes in the bugs_activity table for keywords containing a plus sign or other
regular expression meta-characters.  Myk's first ever Bugzilla checkin!
Patch by Dave Miller <justdave@syndicomm.com> and Myk Melez <myk@mozilla.org>.
r=myk@mozilla.org,justdave@syndicomm.com