added mock
removed commented out lines
Handle cases for partition with leader=-1 (not defined)
Merge branch 'master' into develop
check for broker None in send_broker_aware_request (added test for it)
Changes based on comments by @rdiomar, plus added LeaderUnavailableError for clarity
fixing _get_leader_for_partition unittests
Merge branch 'master' into develop

Conflicts:
	test/test_unit.py
Fix py26 compatibility issue, add mock to tox
Merge pull request #1 from wizzat/pr109

Fix py26 compatibility issue, add mock to tox
Merge pull request #109 from mrtheb/develop

TopicAndPartition fix when partition has no leader = -1