respond with json if no mimietype was set
add missing unsupported media type error handler
abort(UNSUPPORTED_MEDIA_TYPE) if data is present in the request, it's a POST/PUT, and the mimetype is not application/json or a form
updating custom error handler tests to reflect changes in the custom_error handler function
Merge branch 'master' of github.com:pyfarm/pyfarm-master into content_type_check_fix
adding missing multipart/form-data
switching to set for lookup speed (IGNORED_MIMETYPES is more future proof anyway)
Merge branch 'master' into content_type_check_fix
Merge pull request #140 from pyfarm/content_type_check_fix

no error is raised if you try to PUT/POST data without the proper content type