Oemetadata

Added
- Add WORKFLOWS to automate package build and upload process on test and production PyPI

Changed
- Fix missing json files in pypi oemetadata package
- Update context.json to ensure ontologically annotated metadata can be sparkled 99

Added
- Use [GitHub projects](https://github.com/OpenEnergyPlatform/oemetadata/projects) to organise releases
- Add new example table to show connection to OEO
- Add test for latest directory to CI [PR74]
- Add tests for v151 [PR81]
- Add release version directory for oem-v151

Changed
- Update ``subject`` to work with OEO
- Rename and update ``isAbout`` to work with OEO
- Rename and update ``valueReference`` to work with OEO
- Improve documentation
- Update schema.json
- Update CHANGELOG.md and give names to releases
- Update CONTRIBUTING.md

Added
- Add keys for linked data compatibility: ``context``, ``id``, ``subject``, ``is_about``, ``value_reference``
- Add context.json file
- Add licence information to README.md

Changed
- Clarify instructions for dealing with non-applicable keys (null) and missing values ("todo")
- Make key 13.2 ``timeseries`` a list
- Relocate development information from README.md to CONTRIBUTING.md
- Update all .json files to v1.5.0
- Reintroduce automated tests (CI) by switching form travis-ci to GitHub actions [63]
- Updated schema.json for v1.5.0 now includes the new key ``title`` which describes the title of the current field [56] adapted from [PR43]

Removed
- Delete future directory

Added
- Add directory for v1.4.1
- Add tests for v1.4.1
- Add current section to Changelog, documenting all changes in current branch and stage for release
- Extend black options, COMMAND tox -v now shows exactly what code must be reformatted

Changed
- Rename repository from "metadata" to "oemetadata"

Added
- Add ``timeseries`` to ``temporal``
- Add ``context`` object for project information
- Add ``object`` to ``contributors`` to decide between data and metadata
- Add ``profile`` to ``resources`` according to datapackage standard
- Add ``encoding`` to ``resources`` according to datapackage standard
- Add ``schema`` to ``resources`` according to datapackage standard
- Add ``type`` to ``fields`` for data types
- Add ``primaryKey``
- Add ``foreignKeys``
- Add ``dialect``
- Add ``review``
- Add ``metaMetadata``
- Add ``_comment``

Changed
- Rename ``url`` to ``path`` according to datapackage standard

Added
- OEMetadata version v1.3.0 metadata schema, example, template
- OEMetadata version v1.4.0 metadata schema, example, template
- Python implementation and tests for schema, example, template of v1.3.0
- Python implementation and tests for schema, example, template of v1.4.0
- Implementation of metaschema (draft07) and test of metaschema