Upgraded to Node v0.12.7

[JamesMessinger]

This PR resolves Issue #1 and Issue #2, and also includes PR #3.

I've updated index.js to the latest code from Node v0.12.7. This code was copied straight from joyent/node/lib/path.js

I've also added util as a dependency in package.json, since it is used by the new code.

[cjblomqvist]

This does not fix #1 as briefly mentioned in #6 because this relies on process.platform being available - which it isn't in the browser (unless manually added, but that kind of forfeits the whole purpose of having a module fixing it for you automatically). And a browserify that doesn't work in the browser doesn't really sound too useful either... ;)

I have nothing against the PR though. And my install step can easily be incorporated to fix the issue.

[cjblomqvist]

By the way, I use this shrinkwrap in order to use my version of path-browserify:

{
  "dependencies": {
    "browserify": {
      "version": "12.0.1",
      "from": "browserify@>=12.0.1 <13.0.0",
      "dependencies": {
        "path-browserify": {
          "version": "0.1.0",
          "from": "git://github.com/bbweb/path-browserify.git#general-version"
        }
      }
    }
  }
}

[Hypercubed]

Could really use this. path.posix.resolve is failing.

[goto-bus-stop]

#12 upgraded to Node 8. i'll do a release once tests are ported (#13). thanks!