Removed unused imports.

Author: jmhofer

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

@@ -19,15 +19,13 @@
 import static org.mockito.Mockito.*;
 
 import java.util.Date;
-import java.util.concurrent.Executors;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.atomic.AtomicBoolean;
 
 import org.junit.Test;
 import org.mockito.InOrder;
 import org.mockito.Mockito;
 
-import rx.concurrency.Schedulers;
 import rx.concurrency.TestScheduler;
 import rx.subscriptions.Subscriptions;
 import rx.util.functions.Action0;