Scitools submodule

Second attempt to add scitools recipe as a submodule.

If this is merge people have to type:

```bash
git submodule init  # Just once
git submodule update --recursive  # When updating the submodules only
```

Because I am subscribed to the original `conda-recipes-scitools` repository I will send the submodule changes as PRs here regularly.

The main reason behind this is to take advantage of the work that Scitools guys are doing to create conda packages for various OSes.