Fixed races in test_queue_subscriptions

When checking subscribers, need to check message existence first.
Added INFO message for check if abt branches work
Merge pull request #34 from iron-io/bugfix-pq-subs-404

Bugfix pq subs 404
Omit some tests if @skip flag is set
Fixed synchronization mechanisms
Added sleeps to avoid sending requests too fast
Merge pull request #35 from iron-io/bugfix-omit-and-sync

Bugfix omit and sync
First make sure statuses are correct, then delete
Fixed periodic fall in test_poll

Since size isn't atomic, reload sometimes return values > 0.
Need to try check size again. Shoudn't fall.
Increased response wait timeout in `test_queue_subscriptions`

Should wait more than 60s here, because `retries_delay` is 60s by default.
Increased response wait timeout for getting response of remote side
Merge pull request #36 from iron-io/bugfix-pq-test-202

Bugfix pq test 202