Skylark

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Added:

- support for datetime

sample::

>>> Post.at(1).update(update_at=datetime.now())
<UpdateQuery "update post set post.update_at = '2013-11-21 16:45:57' where post.post_id = 1">

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Added:

- Ability to use SQL functions

Supported SQL functions: `count`, `sum`, `max`, `min`, `lcase`, `ucase`

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- A lot of features are changed.

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Removed:

- `Database.debug`
- `Database.SQL`
- `Database.query_times`

Changes:

- `Database.execute()` now return `rows_affected`, not `rows_matched`
- `model.save()` now return `0` for 'data not changed'
- `select_result.count` return long int now, no `cast to int`

Added:

- Exceptions: `UnSupportedType`, `ForeignKeyNotFound`

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- fix: unicode supporting in process parsing expr string
- fix: remove "avoid primary in set"