Changes to iOS and Android apps: add quiz, ad & social networking

Hi, I have an iOS and Android app 'Animal Hooray' and will like to add a quiz section to it. So what I need is someone to take the app and merge it with another of my apps, the 'Animal World - 100Q Quiz' app. Both the 'Animal Hooray' and the 'Animal World - 100Q Quiz' apps are free to download. So please download them before bidding. You will modify the quiz section to support multimedia (sounds + text) questions. 1- You will also add an ad aggregator which should support banner and interstitial ads on the app. 2- I will require a leaderboard for the quiz section. With the iOS, the Game Centre can be used. For Android, I am open to suggestions. 3- From the Leaderboard, the user to be able to post their score on Facebook, Twitter & Google+, LinkedIn. I 4- I also want you to add social media buttons at the start of the app to encourage people to invite their friends to use the app. 4- If we agree to the project, I will need you to deliver it to me by 10 October. I will provide you with all the existing source codes and you will link the quiz to game center. Happy bidding