Michel grey issue 1582

Following @Tryneus pull request https://github.com/rethinkdb/docs/pull/130

I merged master in this branch (I needed the new python script).
I updated the docs for  `r.and_` and `r.or_`, remove the docs for `r.all` and `r.any`.

We also change the output of the python scripts (it's not `docs.py`), so I updated the gitignore file.

@atnnn would you mind taking a look at it?


I tested 
- the website, it still works fine
- the file `docs.py` (I imported in rethinkdb, and the docs works fine).