WORK IN PROGRESS: Add PurchaseUtils jar and eclipse project

@slygamer

This is not really a pull request, more of a request for comment/help and a way to view the changes I've made. It needs significant clean up still, such as naming the method parameters in the transformations xml.

It does compile, but unfortunately, I get an exception when it tries to call the CreatePurchasable() method. It's confusing as it's JNIEnv.CallObjectMethod that is failing so it's not even getting to the java code. Probably I've done something wrong on the java side.