Select2 version 4 support added - Copy of https://github.com/arkhitech/x-editabletree/select2-4.0.0

Refer 1: vitalets#1058
Refer 2: https://github.com/arkhitech/x-editable/tree/select2-4.0.0

Author: mohammedfaisal

src/containers/editable-container.js

@@ -59,7 +59,8 @@ Applied as jQuery method.
                 //(mousedown could be better than click, it closes everything also on drag drop)
                 $(document).on('click.editable', function(e) {
                     var $target = $(e.target), i,
-                        exclude_classes = ['.editable-container', 
+                        exclude_classes = ['.editable-container',
+					                       '.select2-container',
                                            '.ui-datepicker-header', 
                                            '.datepicker', //in inline mode datepicker is rendered into body
                                            '.modal-backdrop',