Test for event flow
test_flow: reinit zookeeper before the process
rules: email/sms.send() -> email/sms.send_event()
Added strict dependence six == 1.4.1, because newer versions contain a bug associated with the missing module winreg on Linux platform.

https://bitbucket.org/gutworth/six/issue/51/importerror-no-module-named-_winreg-with
https://bitbucket.org/gutworth/six/issue/56/problem-running-on-google-app-engine
setup: verbose comment about six==1.4.1
Merge pull request #36 from mdevaev/flow-test

Test for event flow