buildbot/buildbot — pull request #459 by jgonzalezmendez (2012-06-29 00:29:01+00:00)
Title: Sort changes chronologically for new SourceStamps

When creating a new SourceStamp, comprising changes are not guaranteed
to come sorted chronologically. Sort them to ensure the most recent
Change's attributes are used for the new SourceStamp.

Conflicts:

master/buildbot/sourcestamp.py
master/buildbot/test/unit/test_sourcestamp.py

Change-Id: I682d0c48d1ce56a9cdc889db7325a61478bf8de9