Fix Scala Build

Author: benjchristensen

language-adaptors/rxjava-scala/src/main/scala/rx/lang/scala/Subject.scala

@@ -21,7 +21,7 @@ package rx.lang.scala
 trait Subject[T] extends Observable[T] with Observer[T] {
   private [scala] val asJavaSubject: rx.subjects.Subject[_ >: T, _<: T]
 
-  val asJavaObservable: rx.Observable[_ <: T] = asJavaSubject.toObservable()
+  val asJavaObservable: rx.Observable[_ <: T] = asJavaSubject
 
   override val asJavaObserver: rx.Observer[_ >: T] = asJavaSubject
   override def onNext(value: T): Unit = { asJavaObserver.onNext(value)}

rxjava-core/src/main/java/rx/Observable.java

@@ -6840,6 +6840,10 @@ public final Subscription subscribe(final Action1<? super T> onNext, Scheduler s
         return subscribeOn(scheduler).subscribe(onNext);
     }
 
+    public final Subscription subscribe(final Observer<? super T> observer, Scheduler scheduler) {
+        return subscribeOn(scheduler).subscribe(observer);
+    }
+    
     public final Subscription subscribe(final Observer<? super T> observer) {
         return subscribe(new Subscriber<T>() {