I know this is quite an old post, but just wanted to say thanks; worked a charm!
One thing i did have for those who may use this guide in the future, was my Mac didn't want to open iDMG as it was from an unknown developer.
To get around this simply hold the ctrl key then click the application. Now select Open from the menu and it will ignore the unknown developer stuff.
GreenyGamesStudio
Dale joined
Welcome to Greeny Games Studio, an indipendant game development studio from the UK! I'm working on a few projects right now, including both games and game-related software, but my main by far is my first title Samphi - a story-driven/RPG/sandbox game. You should check it out! It's open for alpha funding so grab a copy for a discounted price and receive all future releases. Samphi is made in GameMaker Studio, and for my other projects I use c++ and .NET for software. Thanks for checking me out and if you want to more about what i'm up to then go to www.greenygames.com