Fixed broken links
Fixed broken links

This patch fixes broken links to RxScalaDemo and other RxScala examples.
It's a fix for #153
phajduk/reactivex.github.io,ReactiveX/reactivex.github.io,ReactiveX/reactivex.github.io,phajduk/reactivex.github.io,BattleShipPark/reactivex.github.io,BattleShipPark/reactivex.github.io,ReactiveX/reactivex.github.io,BattleShipPark/reactivex.github.io,phajduk/reactivex.github.io