Exposing price and currency value for ios and android. Mocking Transaction id, item type, app store for Ios.
Updating ios PriceValue string correctly..
Android null check to avoid exception.
Merge branch 'master' of https://github.com/madangosain/OpenIAB into madangosain-master

Conflicts:
	unity_plugin/unity_src/Assets/Plugins/iOS/AppStoreDelegate.m