Added reCaptcha and Error Page to Contact Form

Spam was still a problem in the contact form, so at the request of the RTPs I added a CAPTCHA to the form. Right now it's a reCaptcha, default red theme. They have a few other built-in themes you can check out that'll probably look better. 

I changed some of the CSS as well (added classes for each input type in the contact form, instead of applying styles directly to the elements) to prevent the reCaptcha from looking like total garbage. It still has some artifacts (hooray table design!), but it's better than it was.

Also, I added the "failure.php" error page for the contact form, since I never actually submitted it after Will finished securing the mail form.