fix exception when there is no timestamp header on received message
Merge pull request #41 from cenkalti/fix_timestamp_none

fix exception when there is no timestamp header on received message
Use the standard github .gitignore
Add an integration test for testing the redelivered flag
Add travis-ci deployment to pypi

Will deploy to pypi when tagged and tests pass
Additional tests and docs for rabbitpy.Message
enable cancellation of consumer