Add migration for BitBucket web hooks

This needs to added only *after* we roll out #255

data/migrations/versions/437ee6269a9d_migrate_bitbucket_services_to_webhooks.py

@@ -0,0 +1,24 @@
+"""Migrate BitBucket services to webhooks
+
+Revision ID: 437ee6269a9d
+Revises: 154f2befdfbe
+Create Date: 2015-07-21 14:03:44.964200
+
+"""
+
+from util.migratebitbucketservices import run_bitbucket_migration
+
+# revision identifiers, used by Alembic.
+revision = '437ee6269a9d'
+down_revision = '2e09ad97b06c'
+
+from alembic import op
+import sqlalchemy as sa
+
+
+def upgrade(tables):
+    run_bitbucket_migration()
+
+
+def downgrade(tables):
+    pass