dependencies need listing and pre-installing

[geeohgeegeeoh]

Unless the go build system can automatically pull them in, the README.md needs to list the pre-dependencies and their version-specific URLs to pull.

[robert-kisteleki]

This is part of the quick start section now.

My understading is that versioning of dependencies is a bit of an issue, not sure how that could be solved in a stable fashion. We'll see.