Resolve compatibility issues with Unity 4.

Fix compatibility issues with CocoaPods 1.0.0.

Fix issues with rewarded video ad requests on Android.

Fix compatibility issues with Google Mobile Ads iOS SDK v7.7.

Update preprocessor directives for iOS post build setup and add request agent to all ad requests from plugin.

Use JarResolver plugin to resolve Google Play services client dependencies, add CocoaPods integration/ automated build settings for iOS projects, add support for Custom In-App purchase flow on Android and ad events refactored with new names.

Moved IInAppBillingService into its own JAR file

Added support for IAP ads.

Fixed manifest merge and touch input issues.