Remove before_install
Remove before_install

See https://github.com/ReactiveX/RxScala/issues/20#issuecomment-57520111
joohnnie/RxScala,zjrstar/RxScala,hermanbanken/RxScala,TracyLu/RxScala,hermanbanken/RxScala,zhongdj/RxScala,jbripley/RxScala,jbripley/RxScala,ReactiveX/RxScala