(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
Ugh, I don't know. I'd ask @haus but he's not here. @geoffnichols you are the originator of [FACT-607](https://tickets.puppetlabs.com/browse/FACT-607); could you please chime in and give us some background?