Fixes #41

Logging was occurring when the request was received, before the
response status code had been determined. As a result, a default of 200
was applied in lieu of the missing value.
Making sure proxy responses have an Allow header value, updating `this.unset()` to utilize abaaso 3.3.23 syntax, updated unit tests to test lifecycle methods
Merge pull request #50 from avoidwork/edge

Minor fixes