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/html-generator.js

@@ -0,0 +1,31 @@
+/**
+HTML resume generator for FluentCV.
+@license Copyright (c) 2015 by James M. Devlin. All rights reserved.
+*/
+
+var TemplateGenerator = require('./template-generator');
+var FS = require('fs-extra');
+var HTML = require( 'html' );
+
+var HtmlGenerator = TemplateGenerator.extend({
+
+  init: function() {
+    this._super( 'html' );
+  },
+
+  /**
+  Generate an HTML resume with optional pretty printing.
+  */
+  onBeforeSave: function( mk, themeFile, outputFile ) {
+    var cssSrc = themeFile.replace( /.html$/g, '.css' );
+    var cssDst = outputFile.replace( /.html$/g, '.css' );
+    FS.copy( cssSrc, cssDst, function( e ) {
+      if( e ) err( "Couldn't copy CSS file to destination: " + err);
+    });
+    return true ?
+      HTML.prettyPrint( mk, { indent_size: 2 } ) : mk;
+  }
+
+});
+
+module.exports = HtmlGenerator;