implementation for STANBOL-1211: The ChunkData now provide information about matchable tokens; the EntityLinkerConfig allows to configurethe minimum chunk match score; the EntityLinkingEngine supports chunks as described by STANBOL-1211

git-svn-id: https://svn.apache.org/repos/asf/stanbol/trunk@1543372 13f79535-47bb-0310-9956-ffa450edef68