Pystow

What's Changed
* Generic ensure by mberr in https://github.com/cthoyt/pystow/pull/43


**Full Changelog**: https://github.com/cthoyt/pystow/compare/v0.4.4...v0.4.5

What's Changed
* Ensure pickle gz by cthoyt in https://github.com/cthoyt/pystow/pull/42


**Full Changelog**: https://github.com/cthoyt/pystow/compare/v0.4.3...v0.4.4

What's Changed
* Add param to pass kwargs to download_from_google by mberr in https://github.com/cthoyt/pystow/pull/41


**Full Changelog**: https://github.com/cthoyt/pystow/compare/v0.4.2...v0.4.3

This release adds several additional `load_*` and `dump_*` functions for RDF using `rdflib`, `pandas` dataframes, CSV, JSON, XML using `lxml`, and pickle. It also adds the hexdigest URL processor suggested by kkaris for when you want to download a file and there's also a file right next to it that has the hexdigest in it.


What's Changed
* Add dump functions and rename some functions by cthoyt in https://github.com/cthoyt/pystow/pull/38
* Add RDFlib load/dump functions by cthoyt in https://github.com/cthoyt/pystow/pull/39
* Add hexdigest URL processor by cthoyt in https://github.com/cthoyt/pystow/pull/35
* Add XML I/O functions by cthoyt in https://github.com/cthoyt/pystow/pull/40


**Full Changelog**: https://github.com/cthoyt/pystow/compare/v0.4.1...v0.4.2

Adds new ensure function `pystow.ensure_pickle` that works the same as `pystow.ensure_json`, but for pickle files.

This PR also adds the first opener functions suggested by bgyori in 36 that work similarly to their `ensure_*` counterparts, but assume the file already exists:
- `pystow.open_csv`
- `pystow.open_json`
- `pystow.open_pickle`

This makes PyStow more extensible to other applications that might write to its directories outside of the `ensure_*` functions.

- Reorganize package to avoid name collisions (this shouldn't have any effect unless you were directly importing `from pystow.module`)
- Add top-level function `pystow.submodule` but it's already deprecated to go along with the other usages. This will be removed in v0.5.0.
- Make docs work properly!

**Full Changelog**: https://github.com/cthoyt/pystow/compare/v0.3.1...v0.4.0