Fork/master

Added e-mail functionality after opening a new order. Configure the following environment variables:

process.env.MAILER_USERNAME: The Google account username to send e-mails from.
process.env.MAILER_PASSWORD: The Google account password to send e-mails from.
process.env.ORDER_ALERTS_FROM: The e-mail which appears in the from field. Typically same as the username.
process.env.ORDER_ALERTS_TO: The e-mail to whom Order alerts should be sent to.