v1.2.0

Main changes:

1. Added "span utils" which serve for entities covering some linear span. The utils then offer methods to determine overlapping elements, getting them in ascending offset order etc. Those tools originate in the jcore-gene-mapper and were used to manage PoS, genes, sentences etc. outside of a CAS.
2. Added a few helpful methods to work with XPath expression with the commons-configuration2 library.