Mapbox-vector-tile

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* Improved results from `on_invalid_geometry_make_valid` when the geometry is self-crossing. It was possible for large parts of the geometry to be discarded, and it is now less likely. See [PR 66](https://github.com/tilezen/mapbox-vector-tile/pull/66) for more information.

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* Custom rounding functions: a `round_fn` parameter was added to the `encode` function, which allows control over how floating point coordinates are transformed to integer ones. See [PR 55](https://github.com/tilezen/mapbox-vector-tile/pull/55).
* Custom validity functions: an `on_invalid_geometry` parameter was added to the `encode` function, which is called when invalid geometry is found, or created through coordinate rounding. See [PR 46](https://github.com/tilezen/mapbox-vector-tile/pull/46).
* Winding order bug fix: See [issue 57](https://github.com/tilezen/mapbox-vector-tile/issues/57) and [PR 59](https://github.com/tilezen/mapbox-vector-tile/pull/59).
* Performance improvements: including a 2x speedup from using `tuple`s instead of `dict`s for coordinates, see [PR 56](https://github.com/tilezen/mapbox-vector-tile/pull/56).
* Improvements to PY3 compatibility: See [PR 52](https://github.com/tilezen/mapbox-vector-tile/pull/52).

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* python3 compatability improvements
* travis integration
* documentation updates
* insert CMD_SEG_END for MultiPolygons
* decode multipolygons correctly
* encode tiles using version 1

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* include README.md in distribution to fix install

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* python3 updates
* enforce winding order on multipolygons
* update key/val handling
* round floating point values instead of truncating
* add option to quantize bounds
* add option to flip y coord system
* add ability to pass custom extents

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* Add compatibility with python 3
* Handle multipolygons as single features
* Use winding order from mapbox vector tile 2.0 spec
* Support custom extents when decoding