* Added select-payment-method.component in shared lib
Because we're going to be implementing the same functionality for providers and orgs/users, I wanted to start moving some of this shared functionality into libs so it can be accessed in both web and bit-web. Additionally, the Stripe and Braintree functionality has been moved into their own services for more central management.
* Added generalized manage-tax-information component to shared lib
* Added generalized add-account-credit-dialog component to shared libs
* Added generalized verify-bank-account component to shared libs
* Added dialog for selection of provider payment method
* Added provider-payment-method component
* Added provider-payment-method component to provider layout
