Pod version 0.5.1

Update versioning info on README

Update podspec to v0.3.0

Updated podspec to version 0.2.10 and added tvOS deployment target

Updated podspec to version 0.2.9

Added completeTransactions()

Podspec version 0.2.7

Added Changelog

Restore all product IDs at once

Fix Swift 2.2 warnings, add Carthage support