migrated to dominator >=9
tox.ini: added dominator test
tox.ini: use sitepackages to speed up tests
added obedient.zookeeper as dependency
tox.ini: do not use editable install  mode for testing
setup.py: depend on obedient.zookeeper>=1.5
migrated to dominator>=9.1
Merge pull request #12 from nikicat/master

migration to dominator >=9.1