Docker is not able to include extras with node v4.0.0

[cmtt]

With the current stable release of Node.js, docker is not able to bundle extras.

According to Node's path.js and according test/parallel/test-path.js, a TypeError is thrown when calling path.basename() with a non-string second argument.
This behavior is intended by Node's developers, it seems to have been disabled in the iojs period in order to maintain backwards compatibility for a while.

When starting docker with "--extras [extras]" , this error is thrown:

path.js:548
    throw new TypeError('ext must be a string');
    ^

TypeError: ext must be a string
    at posix.basename (path.js:548:11)
    at Array.map (native)
    at Docker.renderCodeHtml (~/docker/src/docker.js:1280:22)
    at ~/docker/src/docker.js:407:18
    at next (~/docker/src/docker.js:1085:37)
    at ~/docker/src/docker.js:1092:7
    at next (~/docker/src/docker.js:1150:39)
    at Docker.highlighExtractedCode (~/docker/src/docker.js:1164:3)
    at Docker.extractDocCode (~/docker/src/docker.js:1128:8)
    at next (~/docker/src/docker.js:1089:10)

Docker is using path.basename as following.

var html = this.renderTemplate({ /* ... */
   js: this.extraJS.map(path.basename),
  css: this.extraCSS.map(path.basename)
});

Therefore, path.basename() is called in the wrong scope (which is being ignored), but Array.prototype.map provides the actual index of the current item as second argument, therefore, a TypeError is thrown.

This affects both POSIX and Win32 environments.