Autocomplete from GIS list of CRSs..

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

Closes #32

apps/map/admin.py

@@ -1,7 +1,21 @@
 from django.contrib import admin
+from django import forms
+
+from dal import autocomplete
 from leaflet.admin import LeafletGeoAdmin
 
-from .models import CaseStudy
+from .models import CaseStudy, SpatialRefSys
+
+
+class CaseStudyAdminForm(forms.ModelForm):
+    class Meta:
+        model = CaseStudy
+        widgets = {
+            'coordinate_reference_system': autocomplete.ModelSelect2(
+                url='srs-autocomplete'
+            )
+        }
+        fields = '__all__'
 
 
 class CaseStudyAdmin(LeafletGeoAdmin):
@@ -30,4 +44,8 @@ class CaseStudyAdmin(LeafletGeoAdmin):
         ))
     unapprove.short_description = "Un-approve selected case studies"
 
+    form = CaseStudyAdminForm
+
+
 admin.site.register(CaseStudy, CaseStudyAdmin)
+admin.site.register(SpatialRefSys)