Enhancements to the installation instructions.
Enhancements to the installation instructions.

- Installing Erlang instructions for OS X
- Installing RabbitMQ from tarball (installation from source repo can be unreliable)
- Show how to do some simple tests to verify correct installation end-to-end
- Added some links to useful websites related to installation and configuration

beni55/nanite,ezmobius/nanite,raphael/nanite