Vincent

This version release is to get parity with the version that's actually been released to PyPI.

- Pie/donut charts thanks to lxyu
- A number of bug fixes, PEP8, and documentation improvements from contributors.

This is a major release, with some pretty important new changes:
- Python 3.2 and 3.3 compatibility thanks to a HUGE effort by [lxyu](https://github.com/lxyu)
- Better unicode handling thanks to [wuub](https://github.com/wuub)
- Async loading of Vega thanks to [minrk](https://github.com/minrk)
- Maps are back! See the docs for [simple maps](http://vincent.readthedocs.org/en/latest/quickstart.htmlsimple-map) and [data bound maps](http://vincent.readthedocs.org/en/latest/quickstart.htmlmap-data-binding)
- Various bug-fixes by other contributors

A couple bug fixes:
- D3 ref is now the official CDN'd version, rather than the old Trifacta hosted one.
- You can now use `vis.padding = 'auto'`, rather than giving it explicit padding parameters
- There is now an example IPython notebook

This is a major release, including a re-write of most of the core functionality thanks to some supreme effort by dnmiller and others. New features include stacked bars, grouped bars, and stacked area, in addition to a complete rewrite of the syntax.

The Vincent team highly recommends reading the [docs](https://vincent.readthedocs.org/en/latest/) to see all of the changes.

Future incremental updates will include a proper Changelog.