rabbitmq-c v0.5.0

Major changes:

• Add amqp_get_broker_properties() function
• Remove distro-specific packaging
• Add -x flag to amqp-consume utilty
• Add amqp_basic_nack() public API
• Add delivery mode constants to amqp.h
• Add support for connection.blocked/connection.unblocked RabbitMQ broker extension

A full listing of changes can be found in the change log:
https://github.com/alanxz/rabbitmq-c/blob/v0.5.0/ChangeLog.md