Provide option to turn off folder structure warnings

[aleksip]

I am using Pattern Lab Node v3.0.1 on Mac, with Node v10.6.0, using a Twig Edition.

Expected Behavior

I am using 'demo' templates to provide data to pattern templates. I would like to keep these in a demo subfolder like so:

├── _patterns
│   ├── 00-atoms
│   │   ├── field
│   │   │   ├── classy-image
│   │   │   │   ├── _classy-image.html.twig
│   │   │   │   └── demo
│   │   │   │       └── classy-image-demo.twig

Actual Behavior

Everything seems to work just fine, but I get lots of warnings like this:

Warning:
A pattern file: 00-atoms/field/classy-image/demo/classy-image-demo.twig was found greater than 3 levels deep from ./source/_patterns/.
It's strongly suggested to not deviate from the following structure under _patterns/
[patternType]/[patternSubtype]/[patternName].[patternExtension]
or
[patternType]/[patternSubtype]/[patternName]/[patternName].[patternExtension]

While Pattern Lab may still function, assets may 404 and frontend links may break. Consider yourself warned. 
Read More: http://patternlab.io/docs/pattern-organization.html

This can get very noisy when generating Pattern Lab, so it would be great to be able to at least turn off these warnings, maybe using a setting in patternlab-config.json, for example.

Steps to Reproduce

Use structure described earlier.

[aleksip]

Just realized this can be done by setting logLevel to error in patternlab-config.json. So I'm happy with that!