fix for STANBOL-1277: The utility methods for generating word matchig regex patterns was added to the PatternUtils (entityhub servicesapi). The TextConstraint to SPARQL conversion was adapted to call this new methods. Also case sensitive string matches are now encoded useing regex. Otherwise it would not be possible to match single words.

git-svn-id: https://svn.apache.org/repos/asf/stanbol/branches/release-0.12@1587844 13f79535-47bb-0310-9956-ffa450edef68