Added missing MemberBuilder docblocks (#25)

lib/MemberBuilder.js

@@ -1,6 +1,12 @@
 /**
  * Handles building members (properties, methods)
  *
+ * This prototype could have easily been refactored into a number of others
+ * (e.g. one for each type of member), but that refactoring has been deferred
+ * until necessary to ensure ease.js maintains a relatively small footprint.
+ * Ultimately, however, such a decision is a micro-optimization and shouldn't
+ * harm the design and maintainability of the software.
+ *
  *  Copyright (C) 2010 Mike Gerwitz
  *
  *  This file is part of ease.js.
@@ -31,6 +37,9 @@ var util = require( __dirname + '/util' ),
 ;
 
 
+/**
+ * Responsible for building class members
+ */
 module.exports = function MemberBuilder()
 {
     // permit omitting 'new' keyword