Update @since tags for 7.6.4 and related javadoc

Change-Id: Ia548da265c4cdfae13c6f0f76939f767ccf60975

client/src/com/vaadin/client/ui/VDragAndDropWrapper.java

@@ -730,6 +730,13 @@ public class VDragAndDropWrapper extends VCustomComponent implements
         return dragImageWidget;
     }
 
+    /**
+     * Internal client side interface used by the connector and the widget for
+     * the drag and drop wrapper to signal the completion of an HTML5 file
+     * upload.
+     * 
+     * @since 7.6.4
+     */
     public interface UploadHandler {
 
         public void uploadDone();

client/src/com/vaadin/client/ui/VFilterSelect.java

@@ -1134,7 +1134,7 @@ public class VFilterSelect extends Composite implements Field, KeyDownHandler,
         /**
          * Creates a new filter select text box.
          * 
-         * @since
+         * @since 7.6.4
          */
         public FilterSelectTextBox() {
             /*-

server/src/com/vaadin/ui/declarative/DesignAttributeHandler.java

@@ -458,7 +458,7 @@ public class DesignAttributeHandler implements Serializable {
     /**
      * Read the alignment from the given child component attributes.
      * 
-     * @since
+     * @since 7.6.4
      * @param attr
      *            the child component attributes
      * @return the component alignment
@@ -486,7 +486,7 @@ public class DesignAttributeHandler implements Serializable {
     /**
      * Writes the alignment to the given child element attributes.
      * 
-     * @since
+     * @since 7.6.4
      * @param childElement
      *            the child element
      * @param alignment

shared/src/com/vaadin/shared/ui/draganddropwrapper/DragAndDropWrapperServerRpc.java

@@ -20,7 +20,7 @@ import com.vaadin.shared.communication.ServerRpc;
 /**
  * RPC interface for calls from client to server.
  * 
- * @since
+ * @since 7.6.4
  * @author Vaadin Ltd
  */
 public interface DragAndDropWrapperServerRpc extends ServerRpc {
@@ -28,8 +28,6 @@ public interface DragAndDropWrapperServerRpc extends ServerRpc {
     /**
      * Called to poll the server to see if any changes have been made e.g. when
      * the upload is complete.
-     * 
-     * @since
      */
     public void poll();