40 add test command

[Connoropolous]

It's working!

Implements hcdev test

closes #40
builds off #44

What it does:

1. builds the files into a Genome bundle
2. in the test folder, install node_modules if necessary
3. runs webpack build step, to convert from ES6 to ES5 js
4. runs the tests using holoconsole command, which know where to look for the Genome bundle

• improve CLI help text
• add nice CLI feedback, sort of like https://github.com/holochain/app-spec-rust/blob/f9233a133d8469d8d5fb89da7844ec9a4a2027ea/build_and_test.sh
• add tests

[zippy]

I would like to recommend that we rename the command in this repo to plain old hc. For now, in advance of actually having different excecutables for the different sub-parts of hc (as we should end up) lets just have one command. Also, from what I see in the devcamp there's the idea that folk will actually be installing holochain-proto as well as holochain-rust based tools, and if that's the case we really need to not have the hcdev name collision.

[Connoropolous]

Sounds good @zippy ... we have #27 open for that

[zippy]

Looks great, I just added a bit into the readme regarding dependencies.