RxScala: Add *Option and *OrElse to BlockingObservable
RxScala: Add latest to BlockingObservable
RxScala: Add toFuture to BlockingObservable
RxScala: Add examples for BlockingObservable
Update '***OrElse' to use Option.getOrElse
Merge branch 'master' into rxscala-bo

Conflicts:
	language-adaptors/rxjava-scala/src/examples/scala/rx/lang/scala/examples/RxScalaDemo.scala
Improve docs of 'toFuture'
Merge pull request #1336 from zsxwing/rxscala-bo

RxScala: Add the rest missing methods to BlockingObservable