New major

[dereuromark]

We want to make a new major soon were we would then remove the deprecations we added:

• IdentifierCollection (Deprecate identifier collection approach. #712)

I would also like to see the following fixed up:

• CakeRouterUrl urlChecker (maybe called "Cake") auto defaults if we detect CakePHP context instead of "Default" ( 5607c7b ), or "Array vs String"
• single URL by default, most apps only ever need a single app
  The array|string magic is not needed anymore then
  It internally accepts both string or array style as always in Cake
• A MultiUrl checker can be added to specifically support multiple loginUrls
• Constants for username/password shoud be at their respective classes instead of abstract, there are several ones that need either different naming or none of those pairs.

In general the next major could be more cake context bound and have it as a real dependency.
makes things much easier and the plugin most likely has never been used in an external context.