fixed several PEP8 violations
removed docstring clearly inherited from contrib code
full refactor of github web hook:
  - removed unnecessary time conversions and replace it with
    dateutil.parser
  - updated dictionary keys that were hitting deprecation warnings (who
    and when for author and when_timestamp)
  - reindentation and other code sanitize
added bitbucket web status hook
Add option to 'Rebuild' button to build updated sources

Right now the Rebuild button builds the exact same checkout as another build. This makes it difficult
for the following workflow:
 * run a build on a branch; it fails
 * fix the branch it built
 * hit "rebuild" -> but it builds the original revision
unit tests on 'buildslave upgrade' command

Test that older buildbot.tac files are updated correctly.
Test that modern buildbot.tac files are not changed.
Merge branch 'bitbucket' of git://github.com/DamnWidget/buildbot
#
# It looks like you may be committing a merge.
# If this is not correct, please remove the file
#	.git/MERGE_HEAD
# and try again.

# Please enter the commit message for your changes. Lines starting
# with '#' will be kept; you may remove them yourself if you want to.
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# On branch master
# All conflicts fixed but you are still merging.
#   (use "git commit" to conclude merge)
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# Changes to be committed:
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#	new file:   master/buildbot/status/web/hooks/bitbucket.py
#	modified:   master/buildbot/status/web/hooks/github.py
#	new file:   master/buildbot/test/unit/test_status_web_change_hooks_bitbucket.py
#	modified:   master/buildbot/test/unit/test_status_web_change_hooks_github.py
#	modified:   master/docs/manual/cfg-changesources.rst
#	modified:   master/docs/manual/cfg-statustargets.rst
#
add relnotes for previous commit
Merge branch 'RebuildOptions' of git://github.com/jaredgrubb/buildbot

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# Changes to be committed:
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#	modified:   master/buildbot/process/builder.py
#	modified:   master/buildbot/status/web/build.py
#	modified:   master/buildbot/status/web/templates/forms.html
#	modified:   master/docs/relnotes/index.rst
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#	modified:   master/buildbot/process/builder.py
#	modified:   master/buildbot/status/web/build.py
#	modified:   master/buildbot/status/web/templates/forms.html
#	modified:   master/docs/relnotes/index.rst
#
Extend the reconfig timer when certain progress lines are seen
Merge branch 'slave-upgrade-tests' of git://github.com/elmirjagudin/buildbot
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#	modified:   ../slave/buildslave/test/unit/test_scripts_upgrade_slave.py
#	modified:   ../slave/buildslave/test/util/misc.py
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Merge branch 'ExtendReconfig' of git://github.com/jaredgrubb/buildbot
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#	modified:   master/buildbot/scripts/logwatcher.py
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add relnotes for previous