add the collector as a management command

This allows the command to be called by cron or a similar external tool

sensors/collector/management/commands/collect.py

@@ -0,0 +1,8 @@
+from django.core.management.base import BaseCommand, CommandError
+from collector.collector import values_to_db
+
+class Command(BaseCommand):
+    help = 'Writes the sense hat values to the db.'
+
+    def handle(self, *args, **options):
+        values_to_db()