support markdown-like emphasis.

js/babl/public/index.html

					el.textContent = match[0];
					return el;
				}
			}, {
				re: /^(\*\*?|__?)([^\s]+)\1$/,
				fn: function(match) {
					var highlight = {"*": "em", "**": "strong", "_": "em", "__": "strong"};
					console.log(match.toString());
					var el = document.createElement(highlight[match[1]]);
					el.textContent = match[2];
					return el;
				}
			}, { re: /.*/, fn: function(match) { return new Text(match[0]); }}];
			function expandWord(word) {