support for soundcloud embeds via oembed.

nice.

js/babl/public/index.html

@@ -48,6 +48,29 @@
					return el;
				}
			}, {
				re: /https?:\/\/.*soundcloud.com\/.*/,
				fn: function(match, msgEl) {
					var el = document.createElement('a');
					el.href = match[0];
					el.textContent = match[0];
					var xhr = new XMLHttpRequest();
					xhr.open('GET', 'https://soundcloud.com/oembed?format=json&maxwidth=450&maxheight=315&url=' + match[0]);
					xhr.onreadystatechange = function() {
						if (xhr.readyState == XMLHttpRequest.DONE && xhr.status == 200) {
							var data = JSON.parse(xhr.responseText);
							var tmpEl = document.createElement("div");
							tmpEl.innerHTML = data.html;
							msgEl.replaceChild(tmpEl.firstChild, el);
						}
					}
					xhr.send();
					return el;
				}
			}, {
				re: /https?:\/\/vimeo.com\/([0-9]+).*/,
				fn: function(match) {
					var el = document.createElement("iframe");