implementation for STANBOL-660: The Content-Language header can now be used to parse the language of the posted content; STANBOL-488: added Configuration Utilities to the EnhancementEngineHelper; changed some inconsistent names found while writing the documentation; added missing configuration properties to the WeightedChain and GraphChain; added EnhancementProperties namespace to the Stanbol mappings in the NamespacePrefixService; corrected the prefix of the namespace in the NamespaceEnum to the same as used in the documentation

git-svn-id: https://svn.apache.org/repos/asf/stanbol/branches/release-0.12@1596518 13f79535-47bb-0310-9956-ffa450edef68