Adding framework for chrome.payments API
Add basic android implementation; move to google.payments namespace
Merge branch 'master' into payments
Add chrome.runtime.platform
Add more API to payments plugin; still using InAppBilling as a dependency
Add google.payments.inapp.platform
Merge branch 'master' into payments
Add IABv3 interface definition
Add IabHelper stock code
Change IAB helper package
Make purchase verification optional in debug mode only
Change to custom Android IAB plugin
Added in-app payments for iOS.

Only `buy` is supported.
Added dynamic loading of products.

Since this plugin doesn't have knowledge of product ids, we load them whenever we're told to buy them.  We keep track of prior loads to prevent unnecessary loads.
Moved StoreKit initialization to a function.

Initialization is no longer called on deviceready, but rather on the first action (so far, just buying).

Also cleaned up the logging.
Added getSkuDetails.

The loading of all valid products is recorded so they can be purchased later without reloading.  Invalid product ids are logged.
Moved StoreKit initialization to deviceready.
Refactored events and added basic error checking.

Also changed `buy` to delegate to platform-specific implementations.
Added more error handling.
Make consistent android error messages