Update to 1.0.0

• Fix PORTNAME, PKGNAMEPREFIX and DISTNAME
• Update RUN_DEPENDS: use newer django
• Fix RUN_DEPENDS: six is not required
• Allow concurrent installation (USE_PYTHON=concurrent)
• Reformat pkg-descr
• Add GitHub repository to WWW
• Take maintainership

Changes: https://github.com/gintas/django-picklefield/blob/master/README.rst#changes