Closes #219: button to force full reindexing

docs-core/src/main/java/com/sismics/docs/core/listener/async/RebuildIndexAsyncListener.java

@@ -63,5 +63,9 @@ public class RebuildIndexAsyncListener {
                 offset += 100;
             } while (fileList.size() > 0);
         });
+
+        if (log.isInfoEnabled()) {
+            log.info("Rebuilding index done");
+        }
     }
 }

docs-core/src/main/java/com/sismics/docs/core/model/context/AppContext.java

@@ -190,7 +190,7 @@ public class AppContext {
     public int getQueuedTaskCount() {
         int queueSize = 0;
         for (ThreadPoolExecutor executor : asyncExecutorList) {
-            queueSize += executor.getQueue().size();
+            queueSize += executor.getTaskCount() - executor.getCompletedTaskCount();
         }
         return queueSize;
     }