For timeouts include the command being run in the failure string
Remove duplicate in doc for 'all' email status mode.
Add a master git+Gerrit configuration sample
Support for --depth flag to repo init.

This allows checking out a shallow clone with reduced history.
(fixes #2754)
(fixes #2754)
Merge samuelmz/buildbot:fixes#2754 (PR #1134)
Merge edmorley/buildbot:master (PR #1130)
Merge dankegel/buildbot-x:master (PR #1131)
Merge alagoutte/buildbot:add_git_gerrit_example (PR #1132)
Update docs and release notes for Repo --depth
Merge rjogrady/buildbot:master (PR #1133)
rename repoDepth to just plain depth, and add a test for it
Update release notes
Sort/group feature release notes

For example, all the Git source step notes are together.
Fix formatting of :bb: macros in relnotes
:bb: -> :bb:bug:
Add missing bb:step and bb:sched
More release note formatting
Fix use of :py:mod: