Top level build/publish script

[clintfred]

As a (Travis) build process
I want to have a script I can execute to build, package, publish binaries, and publish to npm

Probably will need to be worked on in conjunction with #9

Needs further research on how the Travis multi-arch stuff works. Does it kick off a job for each arch? How do we tie them back together? I started thinking about this when trying to write the "top level build/publish script" ticket. We need to publish a binary for each arch/node combo, and then publish to npm.

See https://github.com/IronCoreLabs/recrypt-node-binding/blob/c7f06ba9097bce2ee064409f19ee0bfae131ea8e/publish.js