[fix #49131067] upgraded bunny gem to 0.9.0.pre10

I also removed heart_beat setting from amqp.yml
config file with this commit.
If there a heart_beat setting in amqp.yml config
file, then the bunny will use that value, if there
is no such setting, then it will use the 
heart_beat value provided by the RabbitMQ server.
[fix #49131067] commented the heart_beat value
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