message "This version is not compatible with Drupal 7.x and should be replaced."

Not sure about this. But anyway, i just tried the yeoman version of aurora-generator, it works great (I really admire your work guys), it creates a bundle dir (vendor\bundle\ruby) with ruby packages (with many .info files) inside the generated sub-theme
that probably confuse drupal (that shows "This version is not compatible with Drupal 7.x and should be replaced." message under theme selection page, so its like a "nonexistent fake theme")
deleting ruby dir makes message disappear (but gulp serve doesent works)

testing environment was ubuntu14.04