Get umask from ini file rather than blindly setting it to 0 on daemonize
Enhance tests.support.TestCircus._create_circus to take arbiter_kw as well as the regular kw for workers

This has the side benefit of removing some code duplication
Unit tests for the new umask option
Merge branch 'master' into umask-in-config
Make flake8 happy
Merge pull request #671 from scottkmaxwell/umask-in-config

Umask in config