minor: Improved error messages for Exceptions thorwn by the RESTful NLP Analysis Engine. In detail exceptions will now include information provided by the response entity on status codes >= 300. This will allow Stanbol users to see the original stack trace as provided by the RESTful NLP Analyses service (related to STANBOL-893)

git-svn-id: https://svn.apache.org/repos/asf/stanbol/trunk@1458674 13f79535-47bb-0310-9956-ffa450edef68