Add total_revenue_in_cents to webhooks & api
Merge branch 'master' of github.com:chargify/docs.chargify.com

* 'master' of github.com:chargify/docs.chargify.com:
  change the hosted-page-settings doc so it doesn't say you can use POST to pre-populate the form
  Specify that Braintree Blue "Customer ID" should be used for `vault_token`