Yahoo-finance

- Added support for Python 3.x (thanks to hayd)
- Tests
- Integration with Travis CI (thanks to hayd)

- Fix `Share.get_historical()` when only one value is returned (thanks to tarlabs) 7
- Fix `Share.refresh()` raises exception 11

- Fixed print format specs - working with older versions of Python like 2.6

- Fixed small issue with `get_historical()` that would only return the first year

This version is only to fix problem when uploading package to PyPI


Upload failed (400): This filename has previously been used, you should use a different version.

- Ability to download historical data more than one year - (bypassing the Yahoo! limit)
- Change value "N / A" to "None" in the results
- Bugfixes