dirvish for zip archives

[justinmk]

mentioned at #247 (comment)

lua zip bindings: https://github.com/brimworks/lua-zip

related:

• dirvish for ssh / scp / remote #62

[brianhuster]

I think we can also use the builtin zip.vim plugin. It has a few API (though undocumented) like zip#Read() for opening and editing a file inside zip. I expected zip#Browse() to return a list of files inside zip archive, but quite disappointed that it doesn't.