* Moved all initialisation stuff to init_plemp().
* No longer set and user BaseUrl but use document.baseURI instead.
* Added the function key_handler() for handling key presses.
* Added functionality to dismiss the add/upload dialog when pressing Escape.
* Use mime/types library for MIME type management.
* Use CodeRay for syntax highlighting code/text files.
* Added code to observe the drags; fixed committing position changes to the app.
* Commenced work on the Z-index problem.
* Moved inline CSS to public/plemp.css.
* Improved default for initial random positions.
* Replaced drag.js by dragreg.js which is going to do the position changes
registration via the Draggables object.
* Added Move effect for initial placing.