Disallow one-letter records.
  Moved the email template to a subdirectory
  Removed redundency.
  Use the dedicated email.
  Removed all hardwired 'DHCP.io' from templates.

  This makes it simple to rebrand.
Record IP of the account creator
  Avoid clobbering the lower-case zone with the upper one.

  Use two variables for hte templates now.
  Show domain in capture page.
  Fixed errors.
  Added 'critic' target.

  This runs perlcritic.
  Updated to avoid perlcritic warnings.