Parsing Unicode

[JamesPHoughton]

When foreign characters are used, parser fails. Tests here:
https://github.com/SDXorg/test-models/tree/master/tests/unicode_characters

Need to expand test to also include unicode characters in units, and in docstring components.

[alexprey]

Looks like that this PR #179 should solve this issue

[JamesPHoughton]

Thanks @julienmalard!

[JamesPHoughton]

Special characters parsing seems to still be failing with XMILE parser:
https://github.com/SDXorg/test-models/tree/master/tests/special_characters

https://travis-ci.org/JamesPHoughton/pysd/jobs/406424585#L741-L752

[alexprey]

Looks like we have an issue not with XMILE parser, because in output we have all fields provided by xmile file

[enekomartinmartinez]

Following XMILE documentation, special characters should be surrounded by double quotes, once corrected the test PySD is able to translate and run the model.