add /g to prop trim

Author: tj

index.js

@@ -181,7 +181,7 @@ module.exports = function(css, options){
     // prop
     var prop = match(/^(\*?[-\/\*\w]+)\s*/);
     if (!prop) return;
-    prop = prop[0].replace(/^\s+|\s+$/, '');
+    prop = prop[0].replace(/^\s+|\s+$/g, '');
 
     // :
     if (!match(/^:\s*/)) return error("property missing ':'");