[REVIEW] 2.0.0 (#80)

* first cleanup pass

* More cleanup and removal of delegate methods.

* Framework compiling.

* completion -> completionBlock

* Tests compiling.

* Tests running.

* Update restore tests.

* Make restore block based.

* fix restore failure case.

* Tests passing for non-purchase methods.

* Change purchase method to a block.

* Lol its done.

* Failing test for multiple calls to callback.

* Only call calback once.

* Add tests to ensure only called for the same product.

* Addd test case for calling purchase twice.

* Issue an error if a purchase is attempted for the same product twice.

* Update originalApplicationVersion tests.

* Update delegate tests.

* Set delegate on launch.

* Handle fetching latest purchaser info.

* Remove uneeded calls.

* Cleanup.

* Changes based on test integration.

* Add tests for idempotency

* Refactor callbacks cache.

* Add caching for subscriber GET.

* Cache calls getEntitlements

* Add an isEqual implementation to RCPurchaserInfo

* RCPurchaserInfo -> PurchaserInfo in Swift

* Basic is equal case.

* If active entitlements changes, not equal.

* Add failing test case.

* Fix duplicate makePurchase calls.

* Create a macro for dispatching.

* Move cache checking out of updateCaches.

* Fix race condition.

* Caches last updated doesn't apply to entitlements.

* Refactor caching methods.

* Add more macros.

* Also clear entitlements cache.

* More intelligently handle cache in the getters.

* Get rid of updatePurchaserInfo.

* Simulate deferred called.

* Calls delegate on initialization.

* Review feedback/

* Call delegate when random transactions fire.

* Only send new purchaser info when something changes.

* Make other delegate calls on change only.

* Expect fewer delegate calls.

* Eliminates the need for use_frameworks\!

* Make it more swifty.

* Make more swifty and add price localization.

* Smarter cache handling.

* Improved purchaser info logging.

* Fix RCPurchaserInfo description

* Make products fetching idempotent.

* Rename delegate method for updated purchaser info

* Rename products method.

* Start adding logs.

* Log all the things.

* Fix tests

* Logging for identify and alias.

* Update version numbers and copyright.

* Accept subscription_group_id on post receipt

* Send subscription group identifier.

* Add test for posting subscription group.

* Add failing test for getting missing products.

* Fetch products if missing.

* Cache produts on makePurchase.

* Call delegate even if there is a completion block.

* Log when we set two singletons.

* Setup reset callback.

* Add callback to reset.

* Start cleanup and fix bug.

* Reorganize methods.

* updated some comments in RCPurchases.h

* Add failing tests for identity methods calling delegate.

* Call delegate when calling reset, identify, etc.

* didReceiveUpdated

* Rename delegate method.

* Update README

* README update

added swift and Obj-C labels

* added sample app and updated readme

* removed shared instance setter

* fixed obj-c tag in code sample

* update call delegate when set

* Added OS_ACTIVITY_MODE callout

* Updated code snippets

* make both delegates optional

* Version 2.0.0-rc1

* Update 2.0.0 instructions

Updated install instructions for 2.0.0-rc

* Adds more installation instructions

* Added v2.0 doc links

* adds missing documentation

* Makes sure we don't create alias or identify over the same app user id

* Some small review stuff.

* Fix compile issue.

* updated README

Examples/SwiftExample/SwiftExample.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist

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