Probably due to me being behind a corporate proxy that sniffs https traffic, but other packages that need to make https requests work fine... here's the error:

node install.js

[nodegit] Determining dependencies.
[nodegit] Removing vendor/libgit2.
[nodegit] Fetching vendor/libgit2.

stream.js:94
throw er; // Unhandled stream error in pipe.
^
Error: connect ETIMEDOUT
at errnoException (net.js:901:11)
at Object.afterConnect as oncomplete
npm ERR! nodegit@0.1.4 install: node install.js
npm ERR! Exit status 8
npm ERR!