Genericizing Resources via path prefix

[Tom Zeller]

Whether we use Spring's or java-support's, I think it will make life
easier if we provide a Resource implementation which supports the
"classpath:" and "file:" and maybe "svn:" or "http:" prefixes, so that
we can change between implementations without having to change class
names, meaning that we can use one macro like ${resourcePath} and
maven filtering or whatever pattern replacement we like.

If this exists already and I just have not seen it, please do let me
know. Otherwise, I think this should be part of the Resource review.