STANBOL-868: Added Solr ResourceLoader implementation that supports loading resources from the Stanbol DataFileProvider and an other that allows to explicitly parse the Classloader to be used for loading/instantiating Solr components. The later also supports setting a parent so that it can be used in combination with the first one. Currently those ResourceLoaders are not yet used by the commons.solr.core module as the Constructor that allows explicitly setting the ResourceLoader for Solr has package level visibility.

git-svn-id: https://svn.apache.org/repos/asf/stanbol/trunk@1427798 13f79535-47bb-0310-9956-ffa450edef68
STANBOL-871: The EntityhubLinkingEngine now tracks LabelTokenizer by using a ServiceTracker. If the one with the highest service.ranking changes it resets the LabelTokenizer instance on the managed EntityLinkingEngine instance

git-svn-id: https://svn.apache.org/repos/asf/stanbol/trunk@1427799 13f79535-47bb-0310-9956-ffa450edef68