Add events to allow further external extensibility

[rma12]

Extension.php - Registration of Navigation, Permissions and ApiResource configs have been changed to variables to allow events, during boot exicution, to be able manipulate them.

Manager.php - Overwrite events have been added to the authenticate and checkGroup functions allowing custom methods to replace their logic via event listeners.

token.php - The original config file has been edited to allow extensibility of the columns value via an event listener.