Do not set key on handlers

Author: andreypopp

lib/matchRoutes.js

@@ -69,7 +69,6 @@ function Match(path, route, match) {
 
 Match.prototype.getHandler = function(ignoreRef) {
   var props = {
-    key: this.matchedPath,
     ref: !ignoreRef && this.route ? this.route.ref : undefined
   };
   if (this.route && this.match) {