This is one of Wicket's default string resource loaders.
The package based string resource loader attempts to find the resource from a bundle that corresponds to the supplied component objects package or one of its parent packages.
The search order for resources is component object package towards root package.
This implementation is fully aware of both locale and style values when trying to obtain the appropriate resources.
Looks for file called package.properties
@author Juergen Donnerstag
@author igor.vaynberg