Add clear_cache management command

accounts/management/commands/clear_cache.py

@@ -0,0 +1,7 @@
+from django.core.management.base import BaseCommand
+from django.core.cache import cache
+
+class Command(BaseCommand):
+    def handle(self, *args, **kwargs):
+        cache.clear()
+        self.stdout.write('Cleared cache\n')