Add RxJava delaySubscription(Func0[_ <: Observable[U]]) to CompletenessTest mapping
Add RxJava delaySubscription(Func0[_ <: Observable[U]]) to CompletenessTest mapping

jbripley/RxScala,TracyLu/RxScala,joohnnie/RxScala,hermanbanken/RxScala,hermanbanken/RxScala,zhongdj/RxScala,zjrstar/RxScala,ReactiveX/RxScala,jbripley/RxScala