Add Features to PHP Chat Application

* Strip HTML - users can post HTML in their messages. This needs to be stripped out. The message should only contain text and no html/javascript * See Facebook and Twitter Friends. User can connect their account with Twitter and/or Facebook. The user will then see when their friends enter a chat room. This feature must be implemented using [login to view URL] api * Integrate [login to view URL] - During registration, the user will be prompted to upload an avatar. This feature needs to be changed so we fetch the avatar using the [login to view URL] service. If no avatar is available the user should still be able to upload one manually (file size of uploaded avatar needs to be limited to 500k). Attached is a screenshot of what it will look like (I have already coded the html/css) * Display Room List in Sidebar - Display the current 25 most popular rooms in the sidebar * Share Room on Facebook/Twitter. Display a popup prompting the user to share the room they have created on Facebook or Twitter.