flow-typed: `npm install -g flow-typed` fails on node v4.4.0 and npm 2.x

Created a new issue from the comment on #4.

Running on OS X El Capitan, npm version 2.15.2 and node v4.4.0, I get this:

$ npm install flow-typed -g
-
> nodegit@0.13.2 install /Users/vesa/.nvm/versions/node/v4.4.0/lib/node_modules/flow-typed/node_modules/nodegit
> node lifecycleScripts/install

[nodegit] Fetching binary from S3.
[nodegit] Failed to install prebuilt binary:
{ [Error: Command failed: /bin/sh -c "/Users/vesa/.nvm/versions/node/v4.4.0/lib/node_modules/flow-typed/node_modules/nodegit/node_modules/.bin/node-pre-gyp" install --fallback-to-build=false
module.js:327
    throw err;
    ^

Error: Cannot find module 'nopt'
    at Function.Module._resolveFilename (module.js:325:15)
    at Function.Module._load (module.js:276:25)
    at Module.require (module.js:353:17)
    at require (internal/module.js:12:17)
    at Object.<anonymous> (/Users/vesa/.nvm/versions/node/v4.4.0/lib/node_modules/flow-typed/node_modules/nodegit/node_modules/node-pre-gyp/lib/node-pre-gyp.js:14:12)
    at Module._compile (module.js:409:26)
    at Object.Module._extensions..js (module.js:416:10)
    at Module.load (module.js:343:32)
    at Function.Module._load (module.js:300:12)
    at Module.require (module.js:353:17)
]
  killed: false,
  code: 1,
  signal: null,
  cmd: '/bin/sh -c "/Users/vesa/.nvm/versions/node/v4.4.0/lib/node_modules/flow-typed/node_modules/nodegit/node_modules/.bin/node-pre-gyp" install --fallback-to-build=false' }
[nodegit] Building manually. (You'll be here a while.)
[nodegit] Regenerating and configuring code
nodegit@0.13.2 /Users/vesa/.nvm/versions/node/v4.4.0/lib/node_modules/nodegit
├── promisify-node@0.3.0 (nodegit-promise@4.0.0)
└── fs-extra@0.26.7 (path-is-absolute@1.0.0, klaw@1.3.0, graceful-fs@4.1.4, jsonfile@2.3.1, rimraf@2.5.2)

[nodegit] Configuring libssh2.
ERROR - Could not generate native code
[TypeError: _(...).forEach(...).value is not a function]
[nodegit] Everything is ready to go, attempting compilation
events.js:141
      throw er; // Unhandled 'error' event
      ^

Error: spawn /Users/vesa/.nvm/versions/node/v4.4.0/lib/node_modules/flow-typed/node_modules/nodegit/node_modules/.bin/node-gyp ENOENT
    at exports._errnoException (util.js:870:11)
    at Process.ChildProcess._handle.onexit (internal/child_process.js:178:32)
    at onErrorNT (internal/child_process.js:344:16)
    at nextTickCallbackWith2Args (node.js:442:9)
    at process._tickCallback (node.js:356:17)
npm ERR! Darwin 15.5.0
npm ERR! argv "/Users/vesa/.nvm/versions/node/v4.4.0/bin/node" "/Users/vesa/.nvm/versions/node/v4.4.0/bin/npm" "install" "flow-typed" "-g"
npm ERR! node v4.4.0
npm ERR! npm  v2.15.2
npm ERR! code ELIFECYCLE