(FACT-607) Include facter man pages in the package for OSX.

Without this commit, the facter man page is not included in the package for OSX.

This commit adds the appropriate directives to ext/osx/file_mapping.yaml
to include facter man pages in the package for OSX. This commit should resolve the merge conflict caused by trying to merge the branch `facter-2` into the branch `master`.

Resolves conflicts:
	ext/osx/file_mapping.yaml
That looks to be the case:

```
Branch facter-2 set up to track remote branch facter-2 from origin.
Switched to a new branch 'facter-2'
mckern@flexo facter $ git oneline | grep 17f5e2a 
mckern@flexo facter $ 
```