OPENNLP-1163: Sentence detector doesn't spot abbreviations next to punctuation

[mawiesne]

Change

• verifies OPENNLP-1163 is no longer a concern, thanks to OPENNLP-793 being resolved with OpenNLP version 2.3.1
• adds related test case to SentenceDetectorMEItalianTest to verify abbreviated "articolo" (art.) is handled correctly
• enhances Italian corpus (see Sentences_IT.txt) introduced in OPENNLP-1530 with further examples for use of "nell'art."
• resolves OPENNLP-1163

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