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Unicode support (#135)

* Always treat units as unicode. Closes #133.

Also, allow a file encoding in the coding standards test, so that we can have some literal unicode characters for testing with.

* Fix date2num test which is incorrectly using repr when str was intended.

* Tidy up the Unit constructor for the py2 case, so that it is easier to see that the code can be deleted when the codebase becomes py3 only.

* Handle unicode object in py2 specially, and always ensure that py2k returns a non-unicode for __str__ (unless sys.getdefaultencoding says otherwise).

* Ensure that the error raised in Unit constructor handles unicode too.

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