Modifications to https://github.com/vivo-project/Vitro/pull/14

Restore pause logic to IndexingChangeListener.
Adjust comments, remove compiler warnings and vestigial code items, rename method.

webapp/test/stubs/edu/cornell/mannlib/vitro/webapp/modules/searchIndexer/SearchIndexerStub.java

@@ -32,7 +32,7 @@ public class SearchIndexerStub implements SearchIndexer {
 	}
 
     @Override
-    public void pauseWithoutDeferring() {
+    public void pauseInAnticipationOfRebuild() {
         paused = true;
     }