Introduce formal generators.

Introduce a shallow hierarchy of simple generator classes, collecting
common functionality and allowing for future snap-in generator
replacement. Use John Resig's "class"-based inheritance per
http://ejohn.org/blog/simple-javascript-inheritance/.

src/gen/word-generator.js

@@ -0,0 +1,13 @@
+/**
+MS Word resume generator for FluentCV.
+@license Copyright (c) 2015 by James M. Devlin. All rights reserved.
+*/
+
+var TemplateGenerator = require('./template-generator');
+var WordGenerator = module.exports = TemplateGenerator.extend({
+
+  init: function(){
+    this._super( 'doc', 'xml' );
+  },
+
+});