WSGIResource should support a mechanism for dispatching to other resources

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Perhaps the most common case for WSGI hosting is a WSGI app at "/" with some static content at "/static/". In order for this to work, WSGIResource has to support putChild, or require  hacks like this. It might be useful to allow more selective overrides than putChild provides, since  people sometimes want the static director(y|ies) to be at a path with multiple segments in it.