unity automated build and preserve changes

using UnityEngine;
using System.Collections;
using UnityEditor;



public class EditorHelper {


   [MenuItem ("Build/BuildWebplayerPreservingFolder")]

   public static void BuildAndPreserve(){

      BuildOptions buildOptions = default(BuildOptions);


      // this is the important part!
      buildOptions |= BuildOptions.AcceptExternalModificationsToPlayer;



      // the rest of the code just pulls in the options from User Build Settings:

      string[] levels = new string[EditorBuildSettings.scenes.Length];

      int n=0;
      foreach (EditorBuildSettingsScene scene in EditorBuildSettings.scenes)
      {
         levels[n++] = scene.path;
      }


      BuildTarget buildTarget = BuildTarget.WebPlayer;

      if (EditorUserBuildSettings.webPlayerStreamed) {
         buildOptions |= BuildOptions.BuildAdditionalStreamedScenes;
      }

      if (EditorUserBuildSettings.webPlayerOfflineDeployment) {
         buildOptions |= BuildOptions.WebPlayerOfflineDeployment;
      }

      if (EditorUserBuildSettings.development)
      {
         buildOptions |= BuildOptions.Development;
      }

      if (EditorUserBuildSettings.connectProfiler)
      {
         buildOptions |= BuildOptions.ConnectWithProfiler;
      }

      if (EditorUserBuildSettings.allowDebugging)
      {
         buildOptions |= BuildOptions.AllowDebugging;
      }

      if (EditorUserBuildSettings.appendProject)
      {
         // wtf does this do? script ref page is blank...
      }

      if (EditorUserBuildSettings.installInBuildFolder) {
         buildOptions |= BuildOptions.InstallInBuildFolder;
      }

      buildOptions |= EditorUserBuildSettings.architectureFlags;

      string buildLocation = EditorUserBuildSettings.GetBuildLocation(buildTarget);

      BuildPipeline.BuildPlayer( levels, buildLocation, BuildTarget.WebPlayer, buildOptions);

   }

}