Reverse the available labors list that the fresh labor be matched fir…

…st when distribute.

lib/manager.js

@@ -181,17 +181,19 @@ module.exports = {
 
       Object.keys(waitingBrowsers).forEach(function(browser) {
         var parsedBrowser = parsedBrowsers[browser]
-        for (var i in availableLabors) {
-          var labor = availableLabors[i]
+
+        Object.keys(availableLabors).reverse().some(function(laborId) {
+          var labor = availableLabors[laborId]
           if (isMatch(parsedBrowser, labor.ua)) {
             // browser passed in order.add() cannot be replaced with labor.ua.browser.name
             // the browser specified by user may be: ie, ie/8 or windows/ie/8
             order.add(labor, browser)
             labor.add(order)
-            break
+            return true
           }
-        }
+        })
       })
+
       if (!Object.keys(waitingBrowsers).length) {
         delete waitingOrders[orderId]
       }