added CAPTCHA loading icon & javascript required notice to homepage; still need to refactor code & apply to rest of site
CAPTCHAs now have loading indicators (for both initial load & reloading). imporved CAPTCHA reloading code. refactored CAPTCHA javascript for better modularity. Pages that require javascript now tell the user, instead of just not working. Improved Font Awesome loading times
removed intentional delay on CAPTCHA serving that was introduced for testing