* Rename CheckoutForm to Form
* Create CheckoutForm component
* Simplify directory structure
* Add docs about class name changes
* Add PropTypes to CheckoutForm
* Update skeleton class name
* Extract LoginPrompt
* Move loginToCheckoutUrl to a constant
* Move replaced class name docs to 3.4.0 specific file
* Only show descriptions if shipping/payment methods > 1
* Hide descriptions if no description text is set
* Fix object length
* methods->options
* Counting helpers for shipping rates and packages
* Use new helpers