[patch] Add possibility to specify custom action mapping to execute_manager
|Reported by:||Owned by:||Adrian Holovaty|
|Has patch:||yes||Needs documentation:||no|
|Needs tests:||no||Patch needs improvement:||no|
It would be good to allow to pass custom action_mapping to execute_manager (that is usually called from manage.py).
This will allow to spcecify additional project specific actions (like for loading demo data, see #1978).