StarterKits should be able to override settings in patternlab-config.json

[tburny]

I am using Pattern Lab Node v2.7.2 on Linux, with Node v4.6.2, using the Gulp or Grunt Edition.

By discussion with @bmuenzenmeyer:
I created a Demo StarterKit which is using the Thymol engine. However the Gulp/Grunt Edition come with mustache as preconfigured patternExtension.

StarterKits should be able to overwrite fields in the Edition's [patternlab-config.json](url) so I can change it to "patternExtension": "html" automatically upon npm install.

When a StarterKit is loaded by Pattern Lab, it should look for a starterkit-config.json file, which contains all properties that have to be overridden in the edition's.

We agreed that instead of copying a whole configuration file it would be better to read the starterkit-config.json into patternlab.config and serialize the config file back to disk again - similar to how it is already done for plugins.

[stale]

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