Add a heartbeat parameter for the rabbitmq server connection.
Add default heartbeat value to README.md
Merge pull request #8 from rack-amqp/add_heartbeat_parameter

Add a heartbeat parameter for the rabbitmq server connection.
#12: to_i heartbeat arg
#9: handle lost TCP connections
Merge pull request #15 from rack-amqp/tcp_reconnect

#9: handle lost TCP connections
Merge pull request #13 from rack-amqp/heartbeat_fork

#12: to_i heartbeat arg
Configurable prefetch w/ consumer ack
Merge pull request #18 from rack-amqp/prefetch

Configurable prefetch w/ consumer ack
#to_i that sucker
Merge pull request #19 from rack-amqp/port_to_i

#to_i that sucker
can daemonize and write pid