Sort all_contributors alphabetically by name

- add an order_by('name') clause to the queryset in all_contributors to
sort the results so they'll display alphabetically by name in the client

Connects #209

src/django/api/views.py

@@ -176,7 +176,7 @@ def all_contributors(request):
     response_data = [
         (organization.id, organization.name)
         for organization
-        in Organization.objects.all()
+        in Organization.objects.all().order_by('name')
     ]
     return Response(response_data)