[enh] new command to import directly from compotista public instance

representatives/management/commands/update_eu_mps.py

+import json
+from urllib2 import urlopen
+from django.core.management.base import BaseCommand
+from representatives.utils import import_representatives_from_format
+
+
+class Command(BaseCommand):
+    def handle(self, *args, **options):
+        import_representatives_from_format(json.load(urlopen("http://compotista.mm.staz.be/latest/")), verbose=True)