Merge branch 'new-signup-add-credit-card'
* new-signup-add-credit-card:
Happy path for credit card signup
Panic should work on any value for error
Allow getting default payment method, not just index
Object representing the backend SGX to use
Stop polluting Object namespace with Blather DSL
Work in the presence of em-synchrony
Helper to allow ordering phone number from Bandwidth v2
Helper to get a promise that resolves after N seconds
Every payment kind will need the plan, so put it at the top
Use registration pattern for Payment kinds
Method to bill the plan of a Customer
Use Forwardable for simple delegations
Helper to allow using sync-style code in a Promise context
New signup: go to web to choose credit card
OOB helper
Reject promise on stanza error
Fix typo