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A simple wrapper around the Spreedly Core V1 API [http://spreedlycore.com]

At this stage SpookyCore is not a comprehensive library. It presently implements
the core functionality which we need immediately. In the future it will expand
to include a greater coverage of the API.

USAGE
First, configure SpookyCore:

  SpookyCore.configure(<login>, <secret>, <gateway_token>)

To retrieve a payment method and inspect it is quite simple:

  pm = SpookyCore::PaymentMethod.new(token)
  pm.first_name #=> 'Cassius'

To process a transaction is also simple:

  t = pm.purchase(20, 'AUD')
  t.succeeded? #=> true

The currently supported transactions are:
* purchase
* credit

Yeah, pretty anemic, but luckily the SC API is very simple, so implementing
additional transactions is very simple; more will be added soon.

TODOS
* Greater test coverage
* API documentation
* Implement more of the API (retain etc.)
* Implement accessors for more of the properties on the method and transactions
* Catch authentication errors
* Catch errors when requesting non-existant records
* Catch network errors