Move Binder to a more proper package

Change-Id: Ia3282f98c8dd7068e3367a9e0bd5fc496e57e46c

server/src/main/java/com/vaadin/tokka/server/communication/data/Binder.java → server/src/main/java/com/vaadin/tokka/data/Binder.java

@@ -13,7 +13,7 @@
  * License for the specific language governing permissions and limitations under
  * the License.
  */
-package com.vaadin.tokka.server.communication.data;
+package com.vaadin.tokka.data;
 
 import java.io.Serializable;
 import java.util.Collection;
@@ -22,6 +22,9 @@ import java.util.Set;
 import java.util.function.BiConsumer;
 import java.util.function.Function;
 
+import com.vaadin.tokka.server.communication.data.SelectionModel;
+import com.vaadin.tokka.server.communication.data.SelectionModel.Multi;
+import com.vaadin.tokka.server.communication.data.SelectionModel.Single;
 import com.vaadin.tokka.ui.components.HasValue;
 import com.vaadin.tokka.ui.components.Listing;
 

uitest/src/main/java/com/vaadin/tokka/tests/components/CheckBoxTestUI.java

@@ -2,8 +2,8 @@ package com.vaadin.tokka.tests.components;
 
 import com.vaadin.server.VaadinRequest;
 import com.vaadin.tests.components.AbstractTestUIWithLog;
+import com.vaadin.tokka.data.Binder;
 import com.vaadin.tokka.event.Registration;
-import com.vaadin.tokka.server.communication.data.Binder;
 import com.vaadin.tokka.ui.components.fields.CheckBox;
 import com.vaadin.ui.Button;
 import com.vaadin.ui.Notification;