Reverting #587 as it screws up single selection user experience.

dist/js/bootstrap-multiselect.js

@@ -1171,7 +1171,7 @@
             var justVisible = typeof justVisible === 'undefined' ? true : justVisible;
             
             if(justVisible) {              
-                var visibleCheckboxes = $("li input:not(:disabled)", this.$ul).filter(":visible");
+                var visibleCheckboxes = $("li input[type='checkbox']:not(:disabled)", this.$ul).filter(":visible");
                 visibleCheckboxes.prop('checked', false);
                 
                 var values = visibleCheckboxes.map(function() {
@@ -1187,7 +1187,7 @@
                 }
             }
             else {
-                $("li input:enabled", this.$ul).prop('checked', false);
+                $("li input[type='checkbox']:enabled", this.$ul).prop('checked', false);
                 $("option:enabled", this.$select).prop('selected', false);
                 
                 if (this.options.selectedClass) {

tests/spec/bootstrap-multiselect.js

@@ -256,6 +256,10 @@ describe('Bootstrap Multiselect "Single Selection"', function() {
         });
     });
     
+    it('Deselect all should work.', function() {
+        expect($('#multiselect option:selected').length).toBe(1);
+    });
+    
     afterEach(function() {
         $('#multiselect').multiselect('destroy');
         $('#multiselect').remove();