restore subjects package object for scaladoc

language-adaptors/rxjava-scala/src/main/scala/rx/lang/scala/subjects/package.scala

@@ -0,0 +1,21 @@
+/**
+ * Copyright 2013 Netflix, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package rx.lang.scala
+
+/**
+ * Subjects are Observers and Observables at the same time.
+ */
+package object subjects {}