Merge pull request #601 from sander4318/master

selectAll() does not 'select' options with data-role='divider'.

dist/js/bootstrap-multiselect.js

@@ -1143,7 +1143,7 @@
             }
                 
             if (allCheckboxesCount === visibleCheckboxesCount || justVisible === false) {
-                $("option:enabled", this.$select).prop('selected', true);
+                $("option:not([data-role='divider']):enabled", this.$select).prop('selected', true);
             }
             else {
                 var values = visibleCheckboxes.map(function() {