add support for away-notify cap
Only try to set line.status if awaynotify is enabled
away-notify: add tests
Add capability negotiation support

* Use CAP LS to get a list of supported CAPs from the server
* Send CAP REQ for the CAPs we need, if they exist
* Send CAP END
Merge pull request #17 from maxanton/away-notify

Add support for away-notify
Release 0.4.0 - away-notify and proper capability negotiation
Improvements to capability negotiation
Merge pull request #19 from maxanton/capability-negotiation-fixes

Improvements to capability negotiation
Send CAP ACK for multi-prefix in tests
Merge pull request #20 from maxanton/multi-prefix-in-tests

Send CAP ACK for multi-prefix in tests
release 0.4.1 - I think we are now ircv3 compatible