Fix annoying chrome dual-load bug

# TODO for OSS

* tests

* fix that chrome bug where it loads the doc twice

* Add file extensions ourselves to push state

* add feedback for errors to UI - esp. too long

* make sure file store still functions appropriately

			// Handle pops

			var handlePop = function(evt) {

				var path = evt.target.location.pathname;

				if (path === '/') {

					app.newDocument(true);	

				}

				else {

					app.loadDocument(path.substring(1, path.length));

				}

				if (path === '/') { app.newDocument(true); }

				else { app.loadDocument(path.substring(1, path.length)); }

			};

			// If pop before loading jquery, delay load

			// Set up the pop state to handle loads, skipping the first load

			// to make chrome behave like others:

			// http://code.google.com/p/chromium/issues/detail?id=63040

			setTimeout(function() {

				window.onpopstate = function(evt) {

				try {

					handlePop(evt);

				} catch(err) {

					// not loaded yet

				}

					try { handlePop(evt); } catch(err) { /* not loaded yet */ }

				};

			// Construct app and load if not loaded

			}, 1000);

			// Construct app and load initial path

			$(function() {

				app = new haste('hastebin', { twitter: true });

				handlePop({ target: window });