Fix defect with groups of groups

* Ensure @groups_configs is not redefined
* Added support @default_config['groups']
Merge pull request #61 from indieisaconcept/defect-recursive-groups

Fix defect with groups of groups
Fix missing |
Merge @default_config['groups'] with @people_config['groups']
Merge pull request #63 from indieisaconcept/patch-1

Merge @default_config['groups'] with @people_config['groups']