default to 127.0.0.1 for buildmaster
adding option to log directly to stdout
PEP8 style fixes, made some defaults more explicit
bugfix, 'changes' may not be defined
reject non-push events
use method over property
adding check for X-Hub-Signature
fix exception logging and respond to the request with the error
remove unused import
adding response to github's requests
adding --auth for PB, some minor cleanups
minor logging fixes
added missing response to github
reformat change iteration for readability
request should not be a keyword
default for --auth should match the PBChangeSource defaults
Merge opalmer/buildbot:master (PR #1166)

+autopep8