Polyglot

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* New Features:
- Support Transfer POS Tagging.
- Support supplying `hint_language_code` for `Text`.

* Bug Fix:
- Improve sentence serialization (PR 34)
- Fix rare unicode encode error (PR 35)
- Fix transliteration from languages other than English (PR 46)
- Add link to Github in README (PR 49)
- Make handling of paths more coherent (RP 55)
- Fix normalizing embedding in place for NER corrupts the features of POS (issue 60, PR 62)

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* Change the polyglot models mirror to Stony Brook University DSL lab instead
of Google cloud storage.

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* Polyglot is feature complete.

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* First release on PyPI.