Adding the GitReleaseNotes package

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Adding the build script used to gather the release notes. Gathering the short version (only the issues in the latest release) and the long version (all releases)

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Updating the archiving script to include the full release notes

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Adding the GIT tagging script that will use the short release notes (only issues fixed since the last tag) for the tag comments

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Merge pull request #10 from pvandervelde/issue/automaticreleasenotes

Automatically create release notes from resolved Github issues