Doc updates to catch up with Api Problem changes related to the new HTTP Problem RFC release.
Merge pull request #58 from gsc-frank/api-problem-rfc-update

Doc updates to catch up with Api Problem changes related to the new HTTP Problem RFC release.
[#58] Test fixes

- s/http_status/status/, due to change in zf-api-problem
Rename test case file

- so that class and file names match
Merge branch 'hotfix/58'

Close #58