Library for Greek in Attic alphabet

I’ve added a new orthographic module to the greeklang project. The attic library supports working with texts in the alphabet used in Athens prior to 403 BCE. It implements the same GreekOrthography interface as the classes in the greeklang foundational libraries, and in this 1.0.0. release provides similar methods for working with strings, word tokens, syllabification, accentuation and phonology.

API docs are in place: testable specifications are in draft form and will be included in the web page for attic in the near future.