[K7] Add KUI Yeoman generator. Support creation of components and documentation.

[cjcenizal]

@snide This generator focuses on the creation of components as a collection of JS and SCSS files. You can just use the default "Stateless function" option for the first prompt. Let me know if you'd like any changes to this or if there's anything else we can do to make the SCSS side of things easier.

[snide]

Gonna leave comments as I test it out.

• The where should I go prompt is pretty confusing. The first time you run it it's just empty. From the instructions I assumed it would use the component name to build a dir, so I hit enter. This caused it to fail in the process, might want some error detection here.
• When I ran it the second time it showed an empty () since that was the last one I used.
• Once I figured out it was asking to type it a path name I assumed it meant relative to ui_framework/src/components so i just typed mycomponentname. This of course built it down in Kibana root instead.
• Assume you're trying to make this more generic and usable beyond KUI, but for ease of use, I just expected it to ask for a name, and then build out everything in kui for me.

[snide]

The snippet comments look like they aren't colored properly. The comments themselves could be a bit more useful.

• The export snippet assumes an name\index.js file is built, but it actually creates a name\name.js
• Maybe at least give the file locations of where you should be adding these snippets? Sorry, I'm probably more familiar with this stuff than most and I still had to hunt around a bit to remember which JS files I needed to touch for both the docs and the components themselves. Ok... router, the component index.js file...etc.

[snide]

That said, this is pretty dope. Thanks.

[snide]

Oh. Looks like you should add .yo-rc.json to .gitignore as well.

[snide]

Love this. Thanks so much for adding it. Changes look great.