Rename ScheduledDisposable -> ScheduledSubscription

Observable#subscribe_on incorrectly referred to the latter, but the
class was actually called the former. Looking at similar implementation
it seems to me to be more in line with a subscription than a disposable.

Author: Bjorn Ramberg

lib/rx/subscriptions/scheduled_subscription.rb

@@ -1,8 +1,8 @@
 # Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
 
 module Rx
-  # Represents a disposable resource whose disposal invocation will be scheduled on the specified scheduler
-  class ScheduledDisposable
+  # Represents a subscription that is unsubscribed on the specified scheduler
+  class ScheduledSubscription
 
     attr_reader :scheduler, :subscription
 
@@ -21,12 +21,12 @@ def unsubscribed?
 
     # Unsubscribes the wrapped subscription on the provided scheduler.
     def unsubscribe
-      @scheduler.schedule lambda do
+      @scheduler.schedule lambda {
         unless @subscription.nil?
           @subscription.unsubscribe
           @subscription = nil
         end
-      end
+      }
     end
   end
 end

test/rx/operators/test_synchronization.rb

@@ -0,0 +1,15 @@
+# Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
+
+require "#{File.dirname(__FILE__)}/../../test_helper"
+
+class TestObservableSynchronization < Minitest::Test
+  include Rx::ReactiveTest
+
+  def test_subscribe_on_default_scheduler_does_not_raise
+    Rx::Observable.just(1).subscribe_on(Rx::DefaultScheduler.instance).subscribe
+  end
+
+  def test_subscribe_on_current_thread_scheduiler_does_not_raise
+    Rx::Observable.just(1).subscribe_on(Rx::CurrentThreadScheduler.instance).subscribe
+  end
+end