Added admin command to scan personal history (#58)

Reverted exported history file to exclude timestamp. Simplified logging
for scanning user history.

api/management/commands/update-history.py

@@ -0,0 +1,10 @@
+from django.core.management.base import BaseCommand, CommandError
+from api.utils import parse_history
+from login.models import User
+
+class Command(BaseCommand):
+    help = 'Update history for users who requested it'
+
+    def handle(self, *args, **options):
+        user_id = "polarbier"
+        parse_history(User.objects.get(id=user_id).secret)