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 hook
added documentation about bitbucket hook and its related security issues
replace any '\n' character in the incomming payload string to avoid exceptions
unit test for bitbucket hook added, github tests updated to support author and when_timestamp