Fixed #433. Reworked client-side form logic
Save form_overrides into CustomModelConverter for wtf-peewee's use
Merge pull request #434 from bryhoyt/peewee-form-overrides2

Save form_overrides into CustomModelConverter, to fix #421, in conjunction with https://github.com/coleifer/wtf-peewee/pull/20
Merge pull request #7 from mrjoes/master

Merge from central repo into bryhoyt's fork