By adding the state parameter, slideToggle can now be called in
the following ways:

    slideToggle();
    slideToggle(speed);
    slideToggle(state);
    slideToggle(callback);
    slideToggle(speed,callback);
    slideToggle(state,callback);
    slideToggle(speed,state,callback);

If `state` is `true` then `slideDown` is called.
If `state` is `false` then `slideUp` is called.
If `state` is not a boolean, then the original `slideToggle`
is called. (It was moved to `_slideToggle`)

The Rakefile now supports all the functionality of the Makefile
including only rebuilding files when dependent files change.

To see availible tasks, run:

    rake -T

Only `sh` statements left are either 'java' or 'git' commands,
which should work on Windows, though I still need to test

Also changed the default Rake task to "all" instead of "jquery"
to parallel the Makefile.

…ead of just a single string. It returns true if *any* of the classes match