YUI Loader
    Adds dynamic loading of YUI and external script and css files.
    Calculates dependencies and optimizes the selection of file includes.


3.0.0pr2
    - get requires yui-base
    - loader requires get
    - combo url build process defends against undefined modules
    - Added combo handler support for CSS
    - Filters are correctly applied to combo and fullpath urls
    - Added compat, profiler, yuitest, widget, stylesheet, classnamemanager,
            overlay, plugin, slider, console
    - Added io submodules
    - queue requires event
    - Added submodule metadata logic
    - Added plugin metadata logic
    - Added skin metadata logic

3.0.0pr1
    Initial Release
