Move node-based initialization into separate file

examples/parse.js

 var PSD = require('../');
 
 psd = PSD.open('./examples/images/example.psd', function (psd) {
-  console.log(psd.header.export());
-  console.log(psd.tree().export());
+  psd.image.saveAsPng('./output.png')
 });
 // psd.image.saveAsPng('./output.png').then(function () {
 //   console.log("Finished!");

lib/psd.coffee

-fs        = require 'fs'
+{Module} = require 'coffeescript-module'
 
 File      = require './psd/file.coffee'
 LazyExecute = require './psd/lazy_execute.coffee'
@@ -8,18 +8,11 @@ Resources = require './psd/resources.coffee'
 LayerMask = require './psd/layer_mask.coffee'
 Image     = require './psd/image.coffee'
 
-module.exports = class PSD
+module.exports = class PSD extends Module
   @Node:
     Root: require('./psd/nodes/root.coffee')
 
-  @fromFile: (file) -> new PSD fs.readFileSync(file)
-  @open: (file, cb) ->
-    fs.readFile file, (err, data) ->
-      throw err if err?
-      psd = new PSD(data)
-      psd.parse()
-
-      cb(psd)
+  @extends require('./psd/init.coffee')
 
   constructor: (data) ->
     @file = new File(data)

lib/psd/init.coffee

+fs = require 'fs'
+
+module.exports =
+  extended: (PSD) ->
+    @fromFile = (file) -> new PSD(fs.readFileSync(file))
+    @open = (file, cb) ->
+      fs.readFile file, (err, data) =>
+        throw err if err?
+        psd = new PSD(data)
+        psd.parse()
+
+        cb(psd)
\ No newline at end of file

package.json

@@ -4,7 +4,7 @@
   "dependencies": {
     "coffee-script": "~ 1.7.1",
     "jspack": "~ 0.0.3",
-    "coffeescript-module": "~ 0.1.1",
+    "coffeescript-module": "~ 0.2.1",
     "png": "~ 3.0.3",
     "rsvp": "~ 3.0.6",
     "lodash": "~ 2.4"