Add nest to RxScala
Add nest to RxScala

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