fix(util): addFromURL with URL-escaped file names

[lidel]

This PR solves double-URL-escaping problem happening when already escaped filename is added to IPFS via ipfs.util.addFromURL with wrap-with-directory=true.
(Originally issue found while working on ipfs/ipfs-companion#349)

How to reproduce

ipfs.util.addFromURL('https://upload.wikimedia.org/wikipedia/commons/thumb/c/cf/Doma%C5%BElice%2C_Jir%C3%A1skova_43_%289102%29.jpg/320px-Doma%C5%BElice%2C_Jir%C3%A1skova_43_%289102%29.jpg?foo=bar#buzz', {wrapWithDirectory: true}, (err, result) => {
  if (err) {
    throw err
  }
  console.log(result)
})

Current behavior

Wrapping directory contains URL-escaped file name:

320px-Doma%C5%BElice%2C_Jir%C3%A1skova_43_%289102%29.jpg

Expected behavior

Wrapping directory should list file under original name:

320px-Domažlice,_Jiráskova_43_(9102).jpg

[alanshaw]

LGTM

[lidel]

@alanshaw who is doing the merging in js-ipfs-api these days? You? :)

[alanshaw]

Yes, let me rebase, tests should be passing now - one moment caller