Issues with Symfony events

[PVince81]

• "user_displayName" is actually user id, needs to be named accordingly
• "roleDisaplayName" this typo seems to have infected all layers, please fix in a compatible manner without breaking consumers
• custom group id is missing in all events. Remember that custom group name is not enough to identify a group
• sometimes the field is called "groupName" and sometimes "group_displayName"
• use camel case for all attributes: "userDisplayName" instead of "user_displayName"

[PVince81]

@sharidas

[PVince81]

@sharidas didn't you fix this somewhere already ?

[sharidas]

Here is one fix #146. This is the only one I find from the commits.