* Added: the `enqueueScript()` and the `enqueueStyle()` methods for the post type class.
* Added: the ability to automatically insert page load information in the admin footer if `WPDEBUG` is true.
Done with encapsulating the framework messages used in the load page info class into the message object. Resolves #42
Changed the default set image since WordPress v3.8 does not include the wordpress-logo-2x.png file.
Fixed an issue that the layout of the pages got messed after inserting the page-load footer info and adjusting the style for it.