RxScala: Change "multicast" to be consistent with RxJava
RxScala: Change "multicast" to be consistent with RxJava

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