Upgraded to the new 0.1.4 NodeGit release.

I've recently improved the installation for NodeGit that should cover issues #2 and #3.

NodeGit's flow will now attempt to compile from source specifically for your machine.  If you don't have the right dependencies or the build fails for some reason, NodeGit will fetch a prebuilt binary from S3 that is generated on every release.

Let me know if you encounter any weirdness.