Support Hebrew vowel annotations

[rhdunn]

Hebrew text does not include vowels. There is a system of diacritics (niqqud [1]) that is used to annotate the missing vowels.

The vowel annotation logic should occur between the parse text and phoneme stream phases on text that parse text annotates as being Hebrew script. Then, the phoneme stream phase can use simple pronunciation rules to pronounce the Hebrew consonants and vowel diacritics. It also makes it easier to test the Hebrew vowel annotation logic.

[1] http://en.wikipedia.org/wiki/Niqqud

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