[wip] Adding test mocks

This is a WIP of adding mocks to tests. The goal is to speed up local development by being able to run functional (and mocha tests?) against these `mocks/*.json` files.

1. Using a special Intern reporter `node_modules/.bin/intern-runner config=tests/intern_browser reporters=tests/mockreporter mockLearn=true` it first learns all requests 
1. Then the tests will run against the mocks
1. ~~Currently email mocks are missing / were not generated~~

Generated with https://github.com/vladikoff/fxa-mock-generator