Add function to build manifest file

lib/app.js

@@ -275,3 +275,79 @@ App.prototype.save = function() {
   savr = new Saver(that, html);
   savr.save();
 };
+
+App.prototype.manifest = function() {
+  console.log('Creating Manifest file');
+  var that = this;
+
+  var Scanner = function(app, callback) {
+    var that = this;
+    that.count = 0;
+    that.files = [];
+
+    that.callbackIfDone = function() {
+      if (that.count <= 0) callback(that.files, app.rootDir);
+    };
+
+    that.scan = function(path) {      
+      that.count += 1;
+
+      l.fs.stat(path, function(err, stats) {
+        that.count -= 1;
+
+        if (err) throw err;
+
+        if (stats.isDirectory()) {
+          that.count += 1;
+          l.fs.readdir(path, function(err, subpaths) {
+            that.count -= 1;
+
+            if (err) throw err;
+
+            subpaths.forEach(function(subpath) {
+              if (subpath[0] !== '.') {
+                that.scan(l.path.join(path, subpath));
+              }
+            });
+
+            that.callbackIfDone();
+          });
+
+        } else {
+          that.files.push(path.replace(app.rootDir, ''));
+        }
+
+        that.callbackIfDone();
+      });
+    };
+  };
+
+
+  this.rootDir = l.path.join(this.savePath, this.buildVersion);
+
+  var scanner = new Scanner(this, function (files, rootDir) {
+    var cacheFiles = 'CACHE MANIFEST \n' +
+                     '# List of all resources required by this project \n' +
+                     '# Explicitly cached entries (only the "CACHE" needs to be added) \n'+ 
+                     'CACHE:\n';
+
+    for (var i = 0; i < files.length; i++) {
+      cacheFiles += '/' + that.buildVersion + files[i] + '\n'
+    }
+
+    cacheFiles += 'NETWORK:\n'+
+      '*';
+
+    var manifestPath = l.path.join(rootDir, "app.manifest");
+    console.info('ManifestPath', manifestPath);
+    l.fs.writeFile(manifestPath, cacheFiles, function(err) {
+      if(err) {
+         throw err;
+      } else {
+        console.info("The file was saved!");
+      }
+    }); 
+
+  }).scan(this.rootDir);
+
+};