Updated with date_default_timezone_set

Not sure if it happens on the dev version as well, but on the latest package available date_default_timezone_set isn't set.
After installation it throws a nice error in which it asks you to set it.
Merge pull request #563 from CoolGoose/patch-1

Updated with date_default_timezone_set
bumping composer.lock
Don't remove relations, when editing the 'receiving' end. Fixes #564.
Additional fix to saving contenttype relations. Related to #564.
Allow 'id' and such to be part of the slug. Fixes #565.
Merge pull request #561 from ntomka/master

Little fix for pager
Remove unneeded file.
Fix 'asc' and 'desc' in 'order()' filter.. Fixes #562.