* Make sure the config has a key for the presenter

Also set the default value if for some reason they set the presenter to
a falsey value.
Signed-off-by: Micheal Mand <micheal@kmdwebdesigns.com>

* Add method to check for role slug

Also inherit docblocks from interface
Signed-off-by: Micheal Mand <micheal@kmdwebdesigns.com>

* Add options for custom date fields and field casts
Signed-off-by: Micheal Mand <micheal@kmdwebdesigns.com>

* Clean up config documentation a little bit
Signed-off-by: Micheal Mand <micheal@kmdwebdesigns.com>

* Add `inRole` method from Sentinel to the User interface
Signed-off-by: Micheal Mand <micheal@kmdwebdesigns.com>