add all scene files in project to build settings

AddScenesToBuild.cs

using UnityEngine;
using UnityEditor;
using System.Collections;
using System.Collections.Generic;
using System.IO;

public partial class BonusMenuItems
{
  [MenuItem("Tools/Add All Scenes to Build")]
	static void AddAllScenesToBuild()
	{
		//TODO put this code into some function that can be called from the build process
		List<EditorBuildSettingsScene> editorBuildSettingsScenes = new List<EditorBuildSettingsScene>();

		GameObject.FindObjectOfType<GameInstance>().Scenes.Clear();

		foreach (var v in AssetDatabase.FindAssets("t:scene"))
		{
			string path = AssetDatabase.GUIDToAssetPath(v);
			var bundle = AssetDatabase.GetImplicitAssetBundleName(path);

			if (!string.IsNullOrEmpty(bundle))
			{
				Debug.Log("Found scene "+path+" in bundle "+ bundle+". do not add to build settings!");
				continue;
			}

			string[] parts = path.Split('/');
			string sceneName = parts[parts.Length-1].Replace(".unity","");

			GameObject.FindObjectOfType<GameInstance>().Scenes.Add(sceneName);
			editorBuildSettingsScenes.Add(new EditorBuildSettingsScene(path, true));
		}

		Debug.Log("Added " + editorBuildSettingsScenes.Count + " scenes to build!");
		EditorBuildSettings.scenes = editorBuildSettingsScenes.ToArray();
	}
}