Fixes typo
Merge branch 'master' into 3.0
Fixes .travis.yml
Merge branch 'master' into 3.0
Merge branch 'master' into 3.0
Bumps version to 3.0.15
Merge branch 'master' into 3.0
Fixes librabbitmq version warning.  Closes celery/celery##1995
epoll unregister catches fileno TypeError
Adds Tobias Schottdorf to AUTHORS