Use PHPMailer to facilitate the sending of e-mails via SMTP

PHPMailer can be found at GitHub: https://github.com/PHPMailer/PHPMailer
Send e-mail via PHP page w/ config from POST vars
Adjust contact page's form to post message details to sendmail.php
Merge branch 'php-mail'

* Send e-mail on the server:
  Adjust contact page's form to post message details to sendmail.php
  Send e-mail via PHP page w/ config from POST vars
  Use PHPMailer to facilitate the sending of e-mails via SMTP