Merge pull request #150 from ke4/49131067_upgrade_bunny_gem_to_0_9_0_pre10_version

[fix #49131067] upgraded bunny gem to 0.9.0.pre10
Handle dedicated action for deletion, publish a message on delete action and fix the corresponding spec
Merge pull request #151 from llh1/49200601_publish_message_on_delete_action

Handle dedicated action for deletion, publish a message on delete action...
[fix #49131067] heart_beat value is not mandatory