Update all current dependencies

- [mikeal/request](https://github.com/mikeal/request) to `2.40.x`
- [jashkenas/underscore](https://github.com/jashkenas/underscore) to `1.6.x`
- [caolan/async](https://github.com/caolan/async) to `0.9.x`
- [flatiron/errs](https://github.com/flatiron/errs) to `0.3.x`
- [mikeal/filed](https://github.com/mikeal/filed) to `0.1.x`
- [indutny/node-ip](https://github.com/indutny/node-ip) to `0.3.1`
- removed [indexzero/node-pkginfo](https://github.com/indexzero/node-pkginfo) and [flatiron/utile](https://github.com/flatiron/utile)

Fixes #306