Fix syntetic event notifications and order.

[ed-sat]

Hi! I really appreciate your lib. We use it with our internal system. And after some tests I found that the last patch
from #192
doesn't cover some cases like:

    lvl1dir = root / "repreated_name"
    lvl1dir.mkdir()
    lvl2dir = lvl1dir / "repreated_name"
    lvl2dir.mkdir()
    lvl3dir = lvl2dir / "repreated_name"
    lvl3dir.mkdir()
    lvl4file = lvl3dir / "repreated_name"
    lvl4file.touch()

and

    dir1 = root / "dir1"
    dir1.mkdir()
    dir2 = dir1 / "dir2"
    dir2.mkdir()
    (dir1 / "file").touch()
    (dir2 / "file").touch()

When we create in bulk bunch of the dirs and files.
So I have made some fixes.

[SpartanJ]

Thank you very much again for your collaboration!