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Represent an Alembic configuration.

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        some_param = context.config.get_main_option("my option")

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        from alembic.config import Config
        alembic_cfg = Config("/path/to/yourapp/alembic.ini")

    With a :class:`.Config` object, you can then
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    The :class:`.Config` object can also be constructed without
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        from alembic.config import Config
        alembic_cfg = Config()
        alembic_cfg.set_main_option("script_location", "myapp:migrations")
        alembic_cfg.set_main_option("url", "postgresql://foo/bar")
        alembic_cfg.set_section_option("mysection", "foo", "bar")

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