Autocomplete from GIS list of CRSs..

..using django-autocomplete-light, in both the admin area and the
end-user form

Closes #32

ojusomap/settings.py

@@ -47,6 +47,8 @@ INSTALLED_APPS = [
     'cas_server',
     'compressor',
     'crispy_forms',
+    'dal',
+    'dal_select2',
     'django.contrib.admin',
     'django.contrib.auth',
     'django.contrib.contenttypes',