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Support for using a dedicated read-slave. The read database is specified as a
Model.Meta option, and will be used for SELECT statements:


master = PostgresqlDatabase('master')
read_slave = PostgresqlDatabase('read_slave')

class BaseModel(ReadSlaveModel):
    class Meta:
        database = master
        read_slaves = [read_slave]  # This database will be used for SELECTs.


# Now define your models as you would normally.
class User(BaseModel):
    username = CharField()

# To force a SELECT on the master database, you can instantiate the SelectQuery
# by hand:
master_select = SelectQuery(User).where(...)
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