Prepare for 0.0.4

I'm planning to do a merge & release including recent merges:

* https://github.com/technicalpickles/pager_duty-connection/pull/1
* https://github.com/technicalpickles/pager_duty-connection/pull/2
* https://github.com/technicalpickles/pager_duty-connection/pull/3
* https://github.com/technicalpickles/pager_duty-connection/pull/4
* https://github.com/technicalpickles/pager_duty-connection/pull/6

Hopefully can also get this in:

* https://github.com/technicalpickles/pager_duty-connection/pull/5

I just want to do a smoke test of this branch on some apps I have using this. If you can give it a shot with your apps, that'd be :+1: too 

cc @rhenning @tgraham