Fixed minor code issues caught by jslint. Added more code comments to app.js.

app.js

@@ -77,21 +77,28 @@ These are:
 
 */
 function Newsletter(data) {
-  this.temp = {};
+  this.temp = {};               // temporary Letter object (html, text, subject)
   this.repo = {};
-  this.subscribers = [];
+  this.subscribers = [];        // array of email addresses
-  this.options = {};
+  this.options = {};            // key=>value pairs used during building
-  this.transport_options = {
+  this.transport = null;        // future Transport object
+  this.transport_options = {    // options to be passed to the Transport object
     host: 'localhost',
     port: 25
   };
-  this.transport = null;
   // merge passed Object into Newsletter
-  for (attr in data) {
+  for (var attr in data) {
     if (this[attr]) this[attr] = mergeObjects(this[attr], data[attr]);
     else this[attr] = data[attr];
   }
 }
+/* Method: Newsletter.build(file, options, cb)
+````````````````````````````````
+This method is the first step during the sending of a newsletter. It attempts
+to read in the given file name, optionally replacing particular keys in the file
+with the variables stored in the options object, and eventually calling cb once
+finished.
+*/
 Newsletter.prototype.build = function(file, options, cb) {
   // clear potential old newsletter
   this.temp = {};
@@ -104,6 +111,13 @@ Newsletter.prototype.build = function(file, options, cb) {
   this.temp.text = content;
   this.temp.html = content;
 };
+/* Method: Newsletter.send()
+````````````````````````````````
+This method is the second step of sending a newsletter. It takes the data built
+during the `build` method, as stored in the `temp` property, and attempts to
+send it to all the emails stored in the `subscribers` property through the
+nodemailer Transport as stored in the `transport` property.
+*/
 Newsletter.prototype.send = function() {
   var i = 0;
   var len = this.subscribers.length;
@@ -141,6 +155,11 @@ Newsletter.prototype.send = function() {
     html: (this.temp.html ? this.temp.html : '')
   });
 };
+/* Method: archive(letter, file)
+````````````````````````````````
+This method is the third step of sending a newsletter. It simply archives the
+given file in the 'archive/' directory of the provided newsletter name.
+*/
 Newsletter.prototype.archive = function(letter, file) {
   fs.writeFileSync('./newsletters/'+letter+'/archive/'+path.basename(file), fs.readFileSync(file));
 };
@@ -155,7 +174,7 @@ var mergeObjects = function(obj1, obj2) {
   else obj3 = {};
 
   for (var attr in obj1) { obj3[attr] = obj1[attr]; }
-  for (var attr in obj2) { obj3[attr] = obj2[attr]; }
+  for (attr in obj2) { obj3[attr] = obj2[attr]; }
 
   return obj3;
 };
@@ -163,9 +182,9 @@ exports.mergeObjects = mergeObjects;
 /* Function: sendNewsletter(newsletter object, options, letter, file)
 ````````````````````````````````
 General function that iteratively calls:
-  build
+  newsletter.build
-  send
+  newsletter.send
-  archive
+  newsletter.archive
 */
 var sendNewsletter = function(newsletter, options, letter, file) {
   newsletter.build(file, options, function(err) {});
@@ -195,7 +214,7 @@ if (require.main == module) { // run as an app only if this is the main module
       if (nl.archive == Newsletter.prototype.archive) {
         console.log('I: Newsletter is using default `archive` step');
       }
-      if (nl.transport == null) {
+      if (nl.transport === null) {
         // create default transport
         console.log('I: Newsletter has no custom transport, creating default');
         nl.transport = nodemailer.createTransport(nl.transport_options);