Add field inheritance
Totally -- creating models should be DRY.  This should work and currently does not (need to add some logic in the metaclass).  I'm not sure what you mean by using a global ID, but multi-table inheritance is not something I plan on implementing.  If you're looking for that level of control, definitely would recommend http://www.sqlalchemy.org/docs/orm/inheritance.html
 I saw you were creating a sequence for each primary key. Which is correct.
But with my proposition I was hoping to get one sequence for all tables inheriting of the "coremodel"
I try to implement it, but my python skills are def not that good.
Reading your code taught me a lot about python, but not enough to fork it.

SQLAlchemy is too heavy, I don't really need it for my project.
 I've fixed the bug where fields are not inherited.  As for the part about sharing a sequence, that is not something that will be implemented as part of peewee.

Hi,

It would be nice if something like that could work

``` python
import peewee


Class CoreModel(peewee.Model):

    id = peewee.PrimaryKeyField()
    created = peewee.DatetimeField()

    Class Meta:

         database = db


Class User(CoreModel):

    firstname = peewee.CharField()


Class Car(CoreModel):

    brand = peewee.CharField()


```

I don't want to duplicate my fields.
Also for the id when I'm using a global ID.
