Setup node-libs via Gyp. Implement Array.prototype.lastIndexOf

The files no longer exist at that path. Rather than copying them from `deps` to `src`, `colony.gyp` references the copy in `deps`. Now, you could argue that `deps/node-libs` should be in `.gitignore`, but those files are actually checked into git, for better or worse, so seeing a diff when they change is probably desirable.