Optimizing import statements for better readability and to avoid unused, excessive and duplicating imports in the project. (#294)

caravel/migrations/env.py

@@ -1,9 +1,11 @@
 from __future__ import with_statement
-from alembic import context
-from sqlalchemy import engine_from_config, pool
-from logging.config import fileConfig
+
 import logging
+from logging.config import fileConfig
+
+from alembic import context
 from flask.ext.appbuilder import Base
+from sqlalchemy import engine_from_config, pool
 
 # this is the Alembic Config object, which provides
 # access to the values within the .ini file in use.