message: Associates Subscriptions to Customer
diff: { API_URL } = require('sharify').data
  Model = require './base.coffee'
  Sources = require '../collections/sources.coffee'
  +Subscriptions = require '../collections/subscriptions.coffee'
  Moment = require './mixins/moment.coffee'
  module.exports = class Customer extends Model
  @@ -13,6 +14,9 @@ module.exports = class Customer extends Model
  return @__related__ if @__related__?
  sources = new Sources(@get('sources'))
  + subscriptions = new Subscriptions(@get('subscriptions'))
  @__related__ =
  sources: sources
  + subscriptions: subscriptions
  + subscription: subscriptions.first()
  