Merge pull request #2023 from TheDistantSea/feature/remove-hardcoded-classnames

Remove hardcoded class names from $.fn.select2

select2.js

@@ -3185,7 +3185,7 @@ the specific language governing permissions and limitations under the Apache Lic
                     if ("tags" in opts) {opts.multiple = multiple = true;}
                 }
 
-                select2 = multiple ? new MultiSelect2() : new SingleSelect2();
+                select2 = multiple ? new window.Select2["class"].multi() : new window.Select2["class"].single();
                 select2.init(opts);
             } else if (typeof(args[0]) === "string") {