Make landscape banners full-width

Set currentContentSizeIdentifier in landscape mode per 
https://developer.apple.com/library/ios/documentation/userexperience/Conceptual/iAd_Guide/BannerAdvertisements/BannerAdvertisements.html
Merge pull request #405 from TwoScoopGames/fix-landscape-banners

Make landscape banners full-width
add umeng sdk