[PATCH 10/10] models: Resolve SubfieldBase deprecation warnings

[Finucane, Stephen]

On 10 Jan 23:07, Stephen Finucane wrote:
> SubfieldBase has been deprecated. It is necessary to add a
> 'from_db_value' function in place of this mixin.
> 
> https://docs.djangoproject.com/en/1.9/releases/1.8/#subfieldbase
> 
> Signed-off-by: Stephen Finucane <stephen.finucane at intel.com>

Merged.