Add 3xx status codes to successful apdex calc

Solves slanatech#107

Author: JustDoItSascha

lib/swsReqResStats.js

@@ -54,7 +54,7 @@ SwsReqResStats.prototype.countResponse = function(code,codeclass,duration,clengt
     this.avg_res_clength = Math.floor(this.total_res_clength / this.responses);
 
     // Apdex: https://en.wikipedia.org/wiki/Apdex
-    if( codeclass=="success" ) {
+    if( codeclass === "success" || codeclass === "redirect" ) {
         if (duration <= this.apdex_threshold) {
             this.apdex_satisfied++;
         } else if (duration <= (this.apdex_threshold * 4)) {