Python v2 and v3 compatible

Python v3 (#55)

* Per 'http://python-future.org/automatic_conversion.html' py2 & py3 compatibility.

* Make sure test fails if there is more than one list entry.

* Fix deprecated warning for invalid escapes.

* Support utf-8 in template files

* Add utf-8 characters to a test example

* Unicode example in template input.

* Switch to utf-8 strings and remove unnecessary conversions.

* Remove legacy lint checks

* Migrate StringIO and remove unneeded import six.

* Remove unnecessary explicit unicast declaration.

* oll back changes to 'open'.

* Cosmetic linting.

* Package 'future' needed for importing builtins.
[aliases]
test=pytest

* Add tests and testdata to distribution.

* Use correct install_requires stanza for dependencies.

* Include testdata files in binarty dist for tyesting.