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This saves code in some cases, as it allows us to use some of the nicer Java 7 Files static methods. Mostly, though, it opens the door to using an in-memory filesystem in tests. Eventually there are even more fun possibilities, like teaching parts of SitePaths to be read out of somewhere else entirely (like a git repository). Change-Id: Ifa13772a79ded03049bd9f62ade6e25d19e5bb05