Choose Jhipster version to generate code

Is your feature request related to a problem?

I like to generate (and compare) an application with different Jhipster versions to

a) compare my customization against the default generated app (for my Jhipster version).
b) compare a version with another version.

Describe the solution you'd like

Select the Jhipster version (for example from a combobox) on application generation (or change it under settings).