wp scaffold and WPCS

Files generated by wp scaffold command are not WordPress coding standard compliant!

For example cpt generated:

<img width="1280" alt="screen shot 2017-12-22 at 3 39 29 pm" src="https://user-images.githubusercontent.com/8479569/34301798-5635d66c-e72e-11e7-9062-378b07b4a648.png">

https://github.com/wp-cli/wp-cli/issues/4589