move version checking code into its own folder and file

js/version/version.js

@@ -0,0 +1,31 @@
+var version = {
+	updateInterval: 3000,
+	intervalId: null
+}
+
+version.checkVersion = function () {
+
+	$.ajax({
+		type: 'GET',
+		url: 'githash.php',
+		success: function (data) {
+			// The githash variable is located in index.php
+			if (data && data.gitHash !== gitHash) {
+				window.location.reload();
+				window.location.href = window.location.href;
+			}
+		},
+		error: function () {
+
+		}
+	});
+
+}
+
+version.init = function () {
+
+	this.intervalId = setInterval(function () {
+		this.checkVersion();
+	}.bind(this), this.updateInterval);
+
+}