Mosql

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1. Fixed the compatibility of :mod:`mosql.json` with
:class:`mosql.result.Model`.

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1. The :meth:`mosql.result.Model.save` uses
:attr:`mosql.result.Model.arrange_by` to save the changes on column squashed.
2. The :meth:`mosql.result.Model.clear` is also improved.
3. Improved the program of loading result set.
4. The :meth:`mosql.result.Model.select` or :meth:`mosql.result.Model.where`
returns None if no row is returned.

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1. Improved the code of :class:`mosql.result.Model`.
2. Added :meth:`mosql.result.Model.new`.
3. Added :meth:`mosql.result.Model.add`.
4. Added :meth:`mosql.result.Model.clear`.
5. The :meth:`mosql.result.Model.perform` now supports to call procedure,
execute SQL with parameter and `executemany`.
6. Fixed the compatibility with MySQL.

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1. Improved the code of :class:`mosql.result.Model`.
2. Added :attr:`mosql.result.Model.squash_all` for 1:1 table.
3. Added :meth:`mosql.result.Model.rows` for iterating the rows.
4. The rows in :class:`mosql.result.Model` can be accessed by row index now.
5. Added :meth:`mosql.result.Model.getcur` for customizing cursor.
6. The :meth:`mosql.result.Model.pop` returns the row it poped now.
7. The :meth:`mosql.result.Model.row` and :meth:`mosql.result.Model.col` are removed.

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1. Improved memory usage of :meth:`mosql.result.Model.arrange`.
2. MoSQL supports to use native escape functions now (via :mod:`mosql.psycopg2_escape` or :mod:`mosql.MySQLdb_escape`).

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1. Fixed a bug of :meth:`mosql.result.Model.append`.