Fix Slack notification setup to support the new slack web hook format and convert all existing data to use the new format (so we only have one code path)

data/migrations/versions/5b84373e5db_convert_slack_webhook_data.py

@@ -0,0 +1,24 @@
+"""Convert slack webhook data
+
+Revision ID: 5b84373e5db
+Revises: 1c5b738283a5
+Create Date: 2014-12-16 12:02:55.167744
+
+"""
+
+# revision identifiers, used by Alembic.
+revision = '5b84373e5db'
+down_revision = '1c5b738283a5'
+
+from alembic import op
+import sqlalchemy as sa
+
+from tools.migrateslackwebhook import run_slackwebhook_migration
+
+
+def upgrade(tables):
+    run_slackwebhook_migration()
+
+
+def downgrade(tables):
+    pass