Fixed a problem parsing CSS comments

-- The WS rule was incorrect, so two WHITESPACE tokens in a row wouldn't
work.

cssparser.y

@@ -186,7 +186,6 @@ unquoted_attribute_value_char
 
 WS
   : /*empty*/                                                     { $$ = ''; }
-  | WHITESPACE                                                    { $$ = ''; }
-  | ws WHITESPACE                                                 { $$ = ''; }
+  | WHITESPACE+                                                   { $$ = ''; }
   ;
 

spec/kb-css-spec.js

@@ -116,5 +116,10 @@ describe('css parser', function() {
     expect(css.parse('@foo { nested { arbitrary-stuff; } here(); }')).toEqual([ {name: '@foo', content: "nested { arbitrary-stuff; } here();"} ]);
   });
 
+  it('should ignore CSS comments', function() {
+    expect(css.parse('/*foo*/\n')).toEqual([]);
+    expect(css.parse('/*foo*/foo{}')).toEqual([ {selector: ["foo"]} ]);
+    expect(css.parse('foo{}/*foo*/')).toEqual([ {selector: ["foo"]} ]);
+  });
 });