models: `Clns::PartnerFirm` embed `Clns::PartnerFirm::Bank`, fix #9
i18n: `partner_firm.yml` translationa related to #9
views: `Clns::PartnerFirm` partial `_show.haml` add tab for banks
views: `Clns::PartnerFirm::Bank` CRUD, #9
update CHANGELOG
bump version v0.2.21
Merge branch 'feature/v0.2.21' into develop, #9, #14