v2.0.0-rc1

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This release contains some fixes. Refactoring is also done.

What's Changed

• Fix #4 : both properties license and datePublish are added to the root data entity
• Fix #5 : encoding and decoding of file paths are fixed.
• setId() and setSource() methods are no more available. The new method addContent() is implemented to add content (files, directories, urls,..) to a data entity.
• Appropriate tests are fixed.