Specify the exact versions of all packages used
Specify the exact versions of all packages used

Also, they do not have to be editable. Thanks to Simon Bächler for the
suggestion.

(Adapted; we do not want to fetch the history of those packages, the
current version is enough.)

lucacorsato/feincms-in-a-box,lucacorsato/feincms-in-a-box,lucacorsato/feincms-in-a-box,lucacorsato/feincms-in-a-box