ENH: add to/from_parquet with pyarrow & fastparquet
 xref https://github.com/dask/dask/issues/2127

TODO: these are fixed, waiting for release to update tests.

- [x] ``fastparquet``: [duplicate columns errors msg](https://github.com/dask/fastparquet/issues/118)
- [x] ``pyarrow 0.3``: [passing dataframe with non-string object columns](https://github.com/apache/arrow/pull/465)

This is a wrapper around ``pyarrow`` and ``fastparquet`` to provide seemless IO interop within pandas.

cc @wesm 
cc @martindurant
cc @mrocklin
