Merge pull request #634 from dbaron/master

fix the assumption that arguments to testProp (etc.) are strings

modernizr.js

@@ -325,7 +325,7 @@ window.Modernizr = (function( window, document, undefined ) {
     function testProps( props, prefixed ) {
         for ( var i in props ) {
             var prop = props[i];
-            if ( prop.indexOf("-") == -1 && mStyle[prop] !== undefined ) {
+            if ( !contains(prop, "-") && mStyle[prop] !== undefined ) {
                 return prefixed == 'pfx' ? prop : true;
             }
         }