E-mail users after signing up with their API key details.

Also include user ID information on signup so users don't need to share
their API keys with us for support purposes (so they keys can be kept
more private).
Merge branch 'master' into gsa

Conflicts:
	app/views/accounts/create.html.erb
	config/deploy/production.rb
	config/deploy/staging.rb
	config/locales/en.yml
Setup e-mails to use SMTP.
Raise e-mail delivery errors.
Merge branch 'master' into gsa