Fixes for evolution release (Ann)

1.5.6 (2019-02-12) Evolution release (Ann)
(bluefox) Fix let's encrypt
(bluefox) Fix "iob" script
(Dominic Griesel) Revert the changes to del[Foreign]State, so the object is not deleted.
(bluefox) always install the version from repository and not the latest from npm
(Ingo Fischer) Root should always npm install with --unsafe-perm
(bluefox) fix iobroker stop
(bluefox) fix Empty ID error
(bluefox) fix for formatDate