Cjio

Changed
- version with schemas 1.0.3 (where metadata schema is fixed)
- fix bugs with operators `update_metadata_cmd()` and `get_metadata_cmd()` crashing

Changed
- fix bug about datetime in schema but not put in metadata

Changed
- fix bug: crash when validating files containing Extensions under Windows

Added
- Convert to Binary glTF (glb)
- Convert to Batched 3D Models (b3dm) - Output is probably incorrect though
- Progress bar for the `reproject` command
- Started a proof of concept for an API. You can read about the first struggles in `docs/design_document.ipynb`. Mainly implemented in `models` and a few additional methods in `cityjson`. Plus a bunch of tests for the API ([13](https://github.com/cityjson/cjio/pull/13))
- Add tutorials and dedicated documentation
- Docker image and Travis build for it ([25](https://github.com/cityjson/cjio/pull/25))
- Generate metadata ([56](https://github.com/cityjson/cjio/pull/56))
- STL export format ([66](https://github.com/cityjson/cjio/pull/66))
Changed
- click messages, warnings got their functions and placed into the `utils` module
- only EPSG codes are supported for the CRS's URN
- When `--indent` is passed to `save`, tabs are used instead of spaces. Results in smaller files.
Fixes
- Fix precision when removing duplicates ([50](https://github.com/cityjson/cjio/pull/60))

Changed
- proper schemas are packaged
- clean() operator added

Changed
- CityJSON v1.0.0 supported
- subset() operator: invert --> exclude (clearer for the users)