Merge pull request #16 from neggertz/npe/erlang-24-updates

Npe/erlang 24 updates

Fix incorrect default handle_error/4 implementation

Bump to 0.8.0

Bump AMQP dependency to 0.3.0

This adds support for Erlang 20, and allows us to stop depending on
github dependencies.

Version 0.4.0

Version 0.3.0

Version 0.2.0