Renamed files according to version from ebook

Hey @sawmac,
I started reading ebook and there is no `fadeIn.html` (it was easy to find it but with different name -- `slide.html` in `chapter01`)
![js3e](https://cloud.githubusercontent.com/assets/373530/4521355/25fa97fc-4d0e-11e4-9c8d-fed776454541.png)
I think it's easier to update repository than printed copies, so that's why I made this pull request.
Kind regards,
@szemek