first draft of the extension generator
Merge branch 'master' into feature/gii-extension-generator
minor docs update (still WIP)
Merge commit 'fcac7f64b37c6a8d4ead9816b2580f50580c540d' into feature/gii-extension-generator
updated defaults, UI, validation and templates
added safe validator for keywords
updated docs and hints
fixed typos
updated CHANGELOG
fixed order
Merge pull request #2411 from schmunk42/feature/gii-extension-generator

first draft of the extension generator