Fixed admin access for staff users.
Merge pull request #15 from normanjaeckel/FixAdmin

Fixed admin access for staff users.
Added Constance. Used constance config in templates. Updated README.rst.
Merge pull request #14 from normanjaeckel/Config

Added Constance. Used constance config in templates. Updated README.rst.
Enabled access to constance config for non superusers.
Merge pull request #16 from normanjaeckel/ConfigSuperuser

Enabled access to constance config for non superusers.