…o all viewers receive the new metadata

Signed-off-by: Aymeric Moizard <aymeric@veeting.com>

…o all viewers receive the new metadata

* The edit request have an option to enable the event "edited_event"
* The edited event is only sent if the edit contains "edited_event=true" AND if the metadata has been updated
* Documentation updated

Signed-off-by: Aymeric Moizard <aymeric@veeting.com>

…o all viewers receive the new metadata

* fix typo and documentation text
* add edited_event to the object that performs the automated valitation checks on incoming JSON payloads
* fix coding style
* rename a variable to avoid shadowing

NOTE: add missing new_metadata to the object that performs the automated valitation checks on incoming JSON payloads

Signed-off-by: Aymeric Moizard <aymeric@veeting.com>