Added sub method with user defined id
Added sub method with user defined id

Duckr/SwiftDDP,siegesmund/RealmMeteor,Duckr/SwiftDDP,mjgaylord/SwiftDDP,mjgaylord/SwiftDDP,infinitedg/SwiftDDP,siegesmund/SwiftDDP,siegesmund/SwiftDDP,siegesmund/RealmMeteor,infinitedg/SwiftDDP