Add ability to look up resources for actual class instances.
Some libraries such as Apache Wicket require access to an actual class instance (in the case of Wicket, a Component instance) before resources can be retrieved. Add this capability to Rincl.
This will require primarily the modification of the retrieval methods in Rincled to use an instance rather than a class. Rincl would need the addition of instance-based resources querying method. By default the instance-based methods would delegate to the class-based methods, so for existing implementations that only need class-based lookup everything would continue to work the same after refactoring.