Metacat

Instead of having the perl code generate the catcha content, the template can include the ajax-style of constructing the captcha. This will allow us to use the same method when we include the registration form in the MetacatUI as well.

See:
https://developers.google.com/recaptcha/docs/display?csw=1#AJAX
http://stackoverflow.com/questions/7261436/how-can-i-load-a-recaptcha-form-using-jquery-ajax-while-leaving-the-recaptcha-sc