Changes:
- Switch MASTER_SITES to CHEESESHOP as it ought to be the default for Python software.
- Adjust COMMENT to match the short description from setup.py.
- Add missing RUN_DEPENDS.
- Standardize test invocation.
- Update WWW to point to project's homepage instead of the Git repository.
Thanks to @koobs for reviewing my commit and telling me how I can improve. :)