STANBOL-1094: merged changes related to STANBOL-1172 to the trunk; also changed all WebApplicationExceptions to use the (String,Status) constructor after getting sometimes "SEVERE: Error occurred when processing a response created from an already mapped exception." when using the one taking a Response object.

git-svn-id: https://svn.apache.org/repos/asf/stanbol/trunk@1534929 13f79535-47bb-0310-9956-ffa450edef68