Updating README
Merge pull request #25 from ryanharkins/more_docs

Updating README
Use double quotes
Add Subscription#next_capture_at. Closes #24.
Make subscription payment available through Subscription#payment
Merge pull request #26 from jacegu/payment-in-subscriptions

Make subscription payment available through Subscription#payment
Add the #update_attributes method to Update. This takes an id and a Hash of attributes to update.
Add origin_amount as accessible attribute to transaction
Add info on refunds to the readme
Merge pull request #29 from theodorton/refund-readme

Add info on refunds to the readme
Merge pull request #28 from theodorton/origin-amount

Add origin_amount as accessible attribute to transaction
Merge pull request #27 from Nerian/master

Add a class method to update a subscription
We use double quotes
Extracts resquests into their own class

There is no need for the paymill module to know about the internals of a
request, that can be hidden away in its own class
Moves https setup into a private method
Request related classes now have a single responsibility
Applying Sandi Metz rules
Payments in sync with API
Adds Payments to the README
Removes some data dependencies