Improve TokenizerME to make use of abbreviations provided in TokenizerModel

While working on OPENNLP-1479 and reviewing a PR by l-ma, we identified that TokenizerME doesn't make use of locale/language specific abbreviations provided via the corresponding TokenizerModel.

Therefore, terms will get mis-tokenized if they are abbreviated, such as the German token "S." which represents an abbreviated form of "Seite" (-> page). Instead of being tokenized as ["S."], TokenizerME will incorrectly yield: ["S", "."].

Improvement suggested:

• Make use of the abbreviations dictionary provided by the TokenizerModel
• Adapt the idea suggested and implemented in OPENNLP-570 (SentenceDetectorME) for TokenizerME
• Adjust TokenizerFactoryTest method testCustomPatternForTokenizerMEDeu() for German abbreviations, see sent-detector test case. It should expect and result in 14 tokens, instead of 16 - so there is a TODO here.