groups resource implementation + test
make failure reasons consistent with real implementation (thanks @justinvdm)
slightly better smart group contact matching (thanks @justinvdm)
removing TODO note
better function name (thanks @hodgestar)
stray comment (thanks @justinvdm)
Merge branch 'feature/issue-28-grow-groups-resource-support' into develop
complain loudly when kv.set fails for store_user()
Merge branch 'develop' into release/0.1.x
Version 0.1.17.