nov/rack-oauth2 — pull request #24 by kylewelsby (2012-11-16 14:29:26+00:00)
Title: Accept: application/xml response output. 

Response can not be returns as `application/xml` by defining `HTTP_ACCEPT` header on the request.
`application/json` remains as the default fallback response `Content-Type`.

Also removed authorise exception raise for a HTTP_STATUS response with error message.
This allows for exceeded methods to be handled much better.