Merge pull request #2728 from demkalkov/master

'document.body' instead of 'body' selector

select2.js

@@ -132,7 +132,7 @@ the specific language governing permissions and limitations under the Apache Lic
 
     function measureScrollbar () {
         var $template = $( MEASURE_SCROLLBAR_TEMPLATE );
-        $template.appendTo('body');
+        $template.appendTo(document.body);
 
         var dim = {
             width: $template.width() - $template[0].clientWidth,
@@ -311,7 +311,7 @@ the specific language governing permissions and limitations under the Apache Lic
                 whiteSpace: "nowrap"
             });
             sizer.attr("class","select2-sizer");
-            $("body").append(sizer);
+            $(document.body).append(sizer);
         }
         sizer.text(e.val());
         return sizer.width();
@@ -717,7 +717,7 @@ the specific language governing permissions and limitations under the Apache Lic
 
             this.container.attr("title", opts.element.attr("title"));
 
-            this.body = $("body");
+            this.body = $(document.body);
 
             syncCssClasses(this.container, this.opts.element, this.opts.adaptContainerCssClass);