Send an email when a booking is created

[johnmckerrell]

No description provided.

[JackiePease]

[nodemailer] (https://nodemailer.com) seems to be the most common suggestion and looks as if it does what we want. You can use the gmail API, or SMTP which would allow us to move to another email provider if needed.
I'll set up a test.

[amcewen]

Tried out nodemailer and it seems to work well, and has integrations with Ethereal.email for development and testing.

We'll need different email server details for test/development and production, so I've spun out #58 to cover how we handle that.

Next steps will be to confirm that we can send email from a doesliverpool.com account and then work out how we'd set up templates for HTML and text bodies for the sent email.

[amcewen]

Tested nodemailer with Google mail this evening (as that's what production would use) and it works fine.

[amcewen]

Extended my test email javascript file to pull in mustache and generate the HTML part of the email body from a template. All seems to work okay, so I think the next step is to add it to the main code.