Adding in sample mail chip forms

Adding in the three sample mail chimp forms as requested by Geoff.  More documentation on the css can be found at http://kb.mailchimp.com/article/embed-code-css-reference/

hidden fields http://kb.mailchimp.com/article/how-do-i-add-hidden-fields-in-my-signup-form-easy/

API: http://apidocs.mailchimp.com/api/example-code/