models: `Wstm::Freight` rewrite `#options_for_exp` see #32
models: `Wstm::FreightIn` add methods
i18n: `Wstm::Expenditure` add missing
assets: js, `Wstm.desk.expenditure` cleanup & #31
views: `Wstm::Expenditure` CRUD #30
update CHANGELOG
bump version v0.3.1.7
Merge branch 'feature/v0.3.1.7' into develop