Import "Base" from base instead of models.

Import the "Base" class for models from db.sql.base instead
of db.sql.models.

mediagoblin/media_types/ascii/models.py

@@ -15,7 +15,7 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 
-from mediagoblin.db.sql.models import Base
+from mediagoblin.db.sql.base import Base
 
 from sqlalchemy import (
     Column, Integer, Unicode, UnicodeText, DateTime, Boolean, ForeignKey,

mediagoblin/media_types/image/models.py

@@ -1,4 +1,4 @@
-from mediagoblin.db.sql.models import Base
+from mediagoblin.db.sql.base import Base
 
 from sqlalchemy import (
     Column, Integer, Float, ForeignKey)

mediagoblin/media_types/video/models.py

@@ -15,7 +15,7 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 
-from mediagoblin.db.sql.models import Base
+from mediagoblin.db.sql.base import Base
 
 from sqlalchemy import (
     Column, Integer, SmallInteger, ForeignKey)