Any feature has been implemented.

Now a packaged task can be created and yielded. Program control will return to the yield statement just after any of transferred deferreds is triggered.

 * tests has been written.
AllError has been renamed to the PackagedTaskError, because it is really packaged task error.

Also, for convenience with Any class, that emits the same error.
Refactoring done over packaged task classes (All and Any).

 * both of them has now the same superclass - PackagedTask, which initializes them the same way.
 * functional decomposition done for error checking.