Added missing packages after testing on Ubuntu 14.04

Unsure if I specified these correctly, but they were necessary to get `nodejs index.js` running on Ubuntu 14.04.

Also encountered this error, fixed by symlinking `node` to `nodejs`:

    > execSync@1.0.2 install /home/migurski/openaddresses-conform/node_modules/execSync
    > node install.js
    
    sh: 1: node: not found