Add Learn_Vimscript_the_Hard_Way.recipe

- update readme for #9
- add learn vimscript the hard way
Rename learn python the hard way

- use uppercase to maintain consistency with others.
Update .gitignore: ignore the debug directory

- when you use the following command for debugging:
`$ ebook-convert myrecipe.recipe .epub --test -vv --debug-pipeline debug`
it will create a debug directory.
Merge pull request #11 from lord63/master

Add Learn Vimscript the Hard Way and update something