OPENNLP-676 Fixed bug in the AnnotationComboIterator. The iterators was crahsing or skipping valid tokens if the CAS contained tokens which are outside of the upper annotation bounds. Added a test case to reproduce the observed bug.

git-svn-id: https://svn.apache.org/repos/asf/opennlp/trunk@1634734 13f79535-47bb-0310-9956-ffa450edef68