Add missing license header to BodyStyleName

Change-Id: Ib1652668ca6292fd54edf4f1055034bb061892cd

widgets/src/main/java/com/vaadin/themes/valoutil/BodyStyleName.java

@@ -1,3 +1,19 @@
+/*
+ * Copyright 2000-2014 Vaadin Ltd.
+ * 
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ * 
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+
 package com.vaadin.themes.valoutil;
 
 import com.google.gwt.core.client.EntryPoint;