This is my Unity Editor build script that I use for my games, to automatically build out players and package them in ZIP files.

BuildRadiator.cs

using UnityEngine;
using UnityEditor;
using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using System.IO.Compression;
using Ionic.Zip; // this uses the Unity port of DotNetZip https://github.com/r2d2rigo/dotnetzip-for-unity

// place in an "Editor" folder in your Assets folder
public class BuildRadiator {
	// TODO: turn this into a wizard or something??? whatever

	[MenuItem("BuildRadiator/Build Windows")]
	public static void StartWindows ()
	{
		// Get filename.
		string path = EditorUtility.SaveFolderPanel("Build out WINDOWS to...", 
		                                            GetProjectFolderPath() + "/Builds/", 
		                                            "");
		var filename = path.Split('/'); // do this so I can grab the project folder name
		BuildPlayer ( BuildTarget.StandaloneWindows, filename[filename.Length-1], path + "/" );
	}

	[MenuItem("BuildRadiator/Build Windows + Mac OSX + Linux")]
	public static void StartAll ()
	{
		// Get filename.
		string path = EditorUtility.SaveFolderPanel("Build out ALL STANDALONES to...", 
		                                            GetProjectFolderPath() + "/Builds/", 
		                                            "");
		var filename = path.Split('/'); // do this so I can grab the project folder name
		BuildPlayer ( BuildTarget.StandaloneOSXUniversal, filename[filename.Length-1], path + "/" );
		BuildPlayer ( BuildTarget.StandaloneLinuxUniversal, filename[filename.Length-1], path + "/" );
		BuildPlayer ( BuildTarget.StandaloneWindows, filename[filename.Length-1], path + "/" );
		
	}

	// this is the main player builder function
	static void BuildPlayer ( BuildTarget buildTarget, string filename, string path ) {
		string fileExtension = "";
		string dataPath = "";
		string modifier = "";

		// configure path variables based on the platform we're targeting
		switch ( buildTarget ) {
		case BuildTarget.StandaloneWindows:
		case BuildTarget.StandaloneWindows64:
			modifier = "_windows";
			fileExtension = ".exe";
			dataPath = "_Data/";
			break;
		case BuildTarget.StandaloneOSXIntel:
		case BuildTarget.StandaloneOSXIntel64:
		case BuildTarget.StandaloneOSXUniversal:
			modifier = "_mac-osx";
			fileExtension = ".app";
			dataPath = fileExtension + "/Contents/";
			break;
		case BuildTarget.StandaloneLinux:
		case BuildTarget.StandaloneLinux64:
		case BuildTarget.StandaloneLinuxUniversal:
			modifier = "_linux";
			dataPath = "_Data/";
			switch ( buildTarget ) {
			case BuildTarget.StandaloneLinux: fileExtension = ".x86"; break;
			case BuildTarget.StandaloneLinux64: fileExtension = ".x64"; break;
			case BuildTarget.StandaloneLinuxUniversal: fileExtension = ".x86_64"; break;
			}
			break;
		}

		Debug.Log ("====== BuildPlayer: " + buildTarget.ToString () + " at " + path + filename );
		EditorUserBuildSettings.SwitchActiveBuildTarget(buildTarget);

		// build out the player
		string buildPath = path + filename + modifier + "/";
		Debug.Log ("buildpath: " + buildPath );
		string playerPath = buildPath + filename + modifier + fileExtension;
		Debug.Log ("playerpath: " + playerPath);
		BuildPipeline.BuildPlayer(GetScenePaths(), playerPath, buildTarget, buildTarget == BuildTarget.StandaloneWindows ? BuildOptions.ShowBuiltPlayer : BuildOptions.None);
	
		// Copy files over into builds
		string fullDataPath = buildPath + filename + modifier + dataPath;
		Debug.Log ("fullDataPath: " + fullDataPath );
		CopyFromProjectAssets( fullDataPath, "languages"); // language text files that Radiator uses
		// TODO: copy over readme

		// ZIP everything
		CompressDirectory( buildPath, path + "/" + filename + modifier + ".zip" );
	}

	// from http://wiki.unity3d.com/index.php?title=AutoBuilder
	static string[] GetScenePaths() {
		string[] scenes = new string[EditorBuildSettings.scenes.Length];
		for(int i = 0; i < scenes.Length; i++) {
			scenes[i] = EditorBuildSettings.scenes[i].path;
		}
		return scenes;
	}
	
	static string GetProjectName() {
		string[] s = Application.dataPath.Split('/');
		return s[s.Length - 2];
	}
	
	static string GetProjectFolderPath() {
		var s = Application.dataPath;
		s = s.Substring ( s.Length - 7, 7); // remove "Assets/"
		return s;
	}

	// copies over files from somewhere in my project folder to my standalone build's path
	// do not put a "/" at beginning of assetsFolderName
	static void CopyFromProjectAssets( string fullDataPath, string assetsFolderPath, bool deleteMetaFiles = true ) {
		Debug.Log ("CopyFromProjectAssets: copying over " + assetsFolderPath );
		FileUtil.ReplaceDirectory(Application.dataPath + "/" + assetsFolderPath, fullDataPath + assetsFolderPath ); // copy over languages

		// delete all meta files
		if (deleteMetaFiles) {
			var metaFiles = Directory.GetFiles ( fullDataPath + assetsFolderPath, "*.meta", SearchOption.AllDirectories);
			foreach ( var meta in metaFiles ) {
				FileUtil.DeleteFileOrDirectory( meta );
			}
		}
	}

	// compress the folder into a ZIP file, uses https://github.com/r2d2rigo/dotnetzip-for-unity
	static void CompressDirectory (string directory, string zipFileOutputPath) {
		Debug.Log ("attempting to compress " + directory + " into " + zipFileOutputPath );
		// display fake percentage, I can't get zip.SaveProgress event handler to work for some reason, whatever
		EditorUtility.DisplayProgressBar( "COMPRESSING... please wait", zipFileOutputPath, 0.38f ); 
		using (ZipFile zip = new ZipFile())
		{
			zip.ParallelDeflateThreshold = -1; // DotNetZip bugfix that corrupts DLLs / binaries http://stackoverflow.com/questions/15337186/dotnetzip-badreadexception-on-extract
			zip.AddDirectory (directory);
			zip.Save(zipFileOutputPath);
		}
		EditorUtility.ClearProgressBar();
	}

}