Change import from flask extension for CORS
Change import from flask extension for CORS

    When a user does ``from flask.ext.foo import bar`` it will attempt to
    import ``from flask_foo import bar`` first and when that fails it will
    try to import ``from flaskext.foo import bar``.

See https://github.com/mitsuhiko/flask/blob/master/flask/ext/__init__.py#L10

guardian/alerta,skob/alerta,guardian/alerta,guardian/alerta,skob/alerta,skob/alerta,guardian/alerta,skob/alerta