Add ordering for creditor models
Add ordering for creditor models

refs #127 and #128
fixes #130 and #131

hacklab-fi/asylum,rambo/asylum,hacklab-fi/asylum,ojousima/asylum,ojousima/asylum,hacklab-fi/asylum,HelsinkiHacklab/asylum,ojousima/asylum,HelsinkiHacklab/asylum,rambo/asylum,jautero/asylum,jautero/asylum,HelsinkiHacklab/asylum,rambo/asylum,jautero/asylum,hacklab-fi/asylum,ojousima/asylum,jautero/asylum,rambo/asylum,HelsinkiHacklab/asylum