improved configuration error message when mode 'all' is set in an iterable for a MailNotifier
updating manual to clarify the use of 'all' and 'warnings' as shortcuts in MailNotifier configuration
Fixes #2486: renderables attribute is extended with 'haltOnFailture' and 'flunkOnFailture' in Configure class.
Revert changes to fix distracting whitespaces
renderables attribute extended in ShellCommand class
Clobber if workdir exists but isn't a git checkout. Fixes #2531
set .master for buildsteps
Merge branch 'master' of git://github.com/tflink/buildbot

Conflicts:
	master/buildbot/test/unit/test_status_mail.py
plus autopep8
Merge branch 'bug2486' of git://github.com/rubocoptero/buildbot

Conflicts:
	master/buildbot/steps/shell.py
Merge branch 'bug2531-sqash' of git://github.com/srinupiits/buildbot

Conflicts:
	master/buildbot/steps/source/git.py
	master/buildbot/test/unit/test_steps_source_git.py
	slave/buildslave/commands/base.py
	slave/buildslave/commands/registry.py
plus autopep8
fix ordering sensitivity in listdir test
fix pep8
Merge branch 'fuzz-refactor' of github.com:djmitche/buildbot

Conflicts:
	master/buildbot/test/fuzz/test_lru.py
plus autopep8
Tweak default status email formatting

Use a space instead of line break before "Full details" sentence.

Extra spaces before details URL.

Capitalize "Sincerely"
Fixed renderables duplicate
Merge branch 'renderables_dup' of git://github.com/Ratio2/buildbot

+autopep8
Add a .master to Build objects
Merge branch 'patch-1' of git://github.com/shoelzer/buildbot
don't rely on os.getcwd to get master basedir when looking for templates

Fixes #2586.
Append mode to renderables list in VisualStudio step