Fiona

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- Add single metadata item accessors to fio inf (142).
- Move fio to setuptools entry point (142).
- Add fio dump and load commands (143).
- Remove fio translate command.

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- Always show property width and precision in schema (123).
- Write datetime properties of features (125).
- Reset spatial filtering in filter() (129).
- Accept datetime.date objects as feature properties (130).
- Add slicing to collection iterators (132).
- Add geometry object masks to collection iterators (136).
- Change source layout to match Shapely and Rasterio (138).

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- Implement Collection __getitem__() (112).
- Leave GDAL finalization to the DLL's destructor (113).
- Add Collection keys(), values(), items(), __contains__() (114).
- CRS bug fix (116).
- Add fio CLI program.

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- Addition of cpl_errs context manager (108).
- Check for NULLs with '==' test instead of 'is' (109).
- Open auxiliary files with encoding='utf-8' in setup for Python 3 (110).

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- Convert 'long' in schemas to 'int' (101).
- Carefully map Python schema to the possibly munged internal schema (105).
- Allow writing of features with geometry: None (71).

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- Always register all GDAL and OGR drivers when entering the DriverManager
context (80, 92).
- Skip unsupported field types with a warning (91).
- Allow OGR config options to be passed to fiona.drivers() (90, 93).
- Add a bounds() function (100).
- Turn on GPX driver.