Implement glob builtins

[ereslibre]

Fixes: #39

[flavio]

I left one question.

As a final note, this doesn't implement glob.match, hence we cannot close #39

[ereslibre]

As a final note, this doesn't implement glob.match, hence we cannot close #39

We can close it, this is about glob builtins. #57 was targeting regex builtins, and in that case, that issue had References: instead of Fixes: to signal exactly that.

However, glob.quote_meta is the only builtin for the glob group, and we are good by closing #39 after this merges.