JH4.1 - Small code enhancements: Token values may contain tokens (still simple, low perfomance implementation)

Basic enhancements to support Identity.
Affected classes: Parameter,SetDetail, Url.ResolveToken,
UserList.HasRole
JH4.2 - Code extensions: new class UserLoginInfo + ItemBridge support

Identity basics: UserLoginInfo (new class, to be used by Identity to
store member's external login provider info) + ItemBridge.AddUserLogin
support
JH4.3 - AccountResources: configurable user mngmt pages

AccountResources (new) is an abstract service that allows User
management pages to be replaced with custom implementations.
MembershipAccountResources is default implementation that routes urls to
existing N2 management pages.
N2 code is modified: hardcoded Urls are replaced with urls provided by
the service. See more:  AccountResources.cs
Existing code modified: hardcoded Urls replaced with urls provided by
the service.