Added a section "Load generated models"

Added a secion "Load generated models" to improve visibility of the section which, in this way, looked as a part of mongoid configuration. In this way it has more emphasis.
Merge pull request #275 from Fire-Dragon-DoL/patch-1

Added a section "Load generated models"
restore if respond_to?(:current_user)
Merge pull request #280 from arturtr/master

Fix for 'uninitialized constant Assetable' with mongoid
Merge remote-tracking branch 'upstream/master'
removed imagemgick