Deletes a report from the given Web Intelligence document.
DELETE /documents/<documentID>/reports/<reportID>
Response type: application/xml or application/json
The response is a message stating the success or failure of the request.
DELETE /documents/7858/reports/9372
<success> <message>The resource of type "report" with identifier "9372" has been successfully removed.</message> <id>9372</id> </success>