Implemented: ability to dispatch a registry action (e.g. register) to multiple registries at once.
Implemented: minor modifications due to review feedback
Implemented: ability to read the messages of the last aoccurred errors.
Updated documentation
Refactored: removed unnecessary early return
Refactored: removed unnecessary early return and added documentation
Corrected error message when attaching a registry with an id already used.
Fixed merge conflict
Merge pull request #22 from liip/dispatcher

Implemented: ability to dispatch a registry action (e.g. register) to multiple registries at once.