STANBOL-811: The last version was still not working on weindows, because it could not delete files. This version now creates a single (lazily initialised) Evaluation Solr server that is used for all calles to perfomCVFold(..). The Server is shutdown on calls to deactivate of the engine

git-svn-id: https://svn.apache.org/repos/asf/stanbol/trunk@1450765 13f79535-47bb-0310-9956-ffa450edef68