Merge remote-tracking branch 'upstream/who-broke-builds' into upstream-master

Include information about who changed the build status in notification emails, and enable optional per-input notification of said committers.

Conflicts due to two branches modifying the database schema.

Signed-off-by: Shea Levy <shea@shealevy.com>

Conflicts: src/lib/Hydra/Schema/Jobsets.pm src/sql/upgrade-23.sql

Created by  Shea Levy  on October 15, 2013
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