WIP: extending BB organization serializers
update org serializer code to extend base BB classes and remove some field definitions in serializer
Bump BB version
Merge remote-tracking branch 'upstream/release/bb-development' into feature/126-iban-validation

Conflicts:
	requirements/requirements.txt
Merge remote-tracking branch 'upstream/release/bb-development' into feature/126-iban-validation

Conflicts:
	requirements/requirements.txt
Merge pull request #1127 from onepercentclub/feature/126-iban-validation

CLUB-126 IBAN validation