Single peer conns, advanced scan, clean disconnect

The browser will now cancel an attempt to connect to an already
established peer. The scanning has been revamped, now supports passing
DOM elements list of images, changed XHR request to download image if
there are no peers to normal load. Removed base64 image paradigm from
the server, now images from server are loaded normally, and when sending
to peers transformed into base64. Server now handles the
connection/disconnection of peers more cleanly.