forms.admin: add context manager
forms.admin: add context manager

molokov/mezzanine,frankier/mezzanine,stephenmcd/mezzanine,jerivas/mezzanine,stephenmcd/mezzanine,frankier/mezzanine,frankier/mezzanine,molokov/mezzanine,molokov/mezzanine,stephenmcd/mezzanine,christianwgd/mezzanine,jerivas/mezzanine,dsanders11/mezzanine,dsanders11/mezzanine,christianwgd/mezzanine,jerivas/mezzanine,christianwgd/mezzanine,dsanders11/mezzanine