admin.py: register Place with gisadmin
admin.py: register Place with gisadmin

Place has a PointField which can only be edited using a map in the
admin interface.  So, add a special Geographic Admin for this.

Signed-off-by: Ramkumar Ramachandra <5c355d1d38066ed0c5de420d67c1b5ed0687c4bd@gmail.com>

artagnon/irale