Git tags, release notes and github releases

While moving wiki in the [`org/move-wiki-to-docs`](https://github.com/bio4j/bio4j/tree/org/move-wiki-to-docs) branch, I've moved release notes to the `notes/` folder.

So for those existing releases (0.7, 0.8, 0.9) corresponding git tags should be created and published as [github releases](https://github.com/blog/1547-release-your-software)

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