add bugzilla integration hook. example of writing hook in python. hook updates bugzilla bugs when it sees commit comments that mention bug id, such as "i fixed bug 77". only bugzilla 2.16 supported yet, but easy to extend. bugzilla versions have different schema, i have not used later than 2.16.

1 files updated, 0 files merged, 0 files removed, 0 files unresolved
removing b
this update spans a branch affecting the following files:
 b
aborting update spanning branches!
(use 'hg merge' to merge across branches or 'hg update -C' to lose changes)