* Change UserWarn to DeprecationWarning
* Fix syncdb for different table name between `Model.__tablename__` and settings bug
* Change UserWarn to DeprecationWarning
* Fix syncdb for different table name between `Model.__tablename__` and settings bug
* Remove `get_cached()` and add `cache` parameter to `Model.get()`
* Add `get_local_cache()` and `clear_local_cache()` in order to compatiable
  with SimpleFrame implementation
* ORM `Property.to_str()` will return string but not unicode for CHAR and VARCHAR.
* Simplify server_default, if integer given, it'll be convert to `text(n)`
* `ManyResult.all()` can receive a `cache` parameter