start simpler implementation with better channel management
add new temporary tests
improve tests
write a test for issue #30
rename Bug30 to Bug30Spec
simplify consumer, add a uri parameter to specify rabbimq uri for testing
add "pending Acks" test: check that messages that were delivered but not acked will be delivered again if the channel they were delivered to is closed. See the discussion for issue #30
consumer: add "crash & restart" test
see issue #30: a consumer with opending acks should receive pending messages again if its channel crashes
reset version to 1.3-SNASPHOT