Merge pull request junit-team#533 from marcphilipp/fix-531

Use TimeUnit.NANOSECONDS for JDK 5 compatibility

src/main/java/org/junit/experimental/ParallelComputer.java

@@ -41,7 +41,7 @@ public void schedule(Runnable childStatement) {
                 public void finished() {
                     try {
                         fService.shutdown();
-                        fService.awaitTermination(Long.MAX_VALUE, TimeUnit.DAYS);
+                        fService.awaitTermination(Long.MAX_VALUE, TimeUnit.NANOSECONDS);
                     } catch (InterruptedException e) {
                         e.printStackTrace(System.err);
                     }