adds failing test
test for sleep_until_queue_exists
adds spec for poll
check @q.poll called with block
@q = new.queues.create(id), then sleep_until_queue_exists
removes requirement for network access (oops)
really not doing any network access this time
Merge pull request #3 from BBC-News/queue_spec

[READY] Alephant::Queue specs
Merge branch 'master' of github.com:BBC-News/alephant into alephant-tests