Firstly, promisify mailer() so we can turn it from sync to async
Fetch all localised templates from the fxa-content-server and use them
No need to pass i18n to mailer anymore
Remove email templates since now fetch from fxa-content-server
Pass email to the templating for substitution
Add content templates to the mail_helper.js to serve for us when testing
Use our own fake content server when testing
Add separate config files for various tests for local template server
Add a script to fetch all the current templates from a local fxa-content-server
Add a templateServer config item
First dump of templates
Read local templates first, then fetch remote ones
Make sure all tests pass by defining where the template server is
Remove win32