New metadata for setup.py, version number in __version__ string.

Jan Pöppelrequested to merge
hbuschme:metadata into master

Created by: hbuschme

Updated metadata a as discussed in pull request #5.

We could think about replacing the fields author and author_email with maintainer and maintainer_email though, see the PEP 345.

We should also think about adding additional metadata attributes listed in PEP 345, e.g., license information and Python compatibility

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