Refactor RubyFileStat and RubyFileTest to use FileResources#1494

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ratnikov wants to merge 2 commits intojruby:jruby-1_7from

ratnikov:refactor-file-stat

Commits on Feb 8, 2014

Harden against null path names.
Dmitry Ratnikov
committed
Added stat method to FileResource and refactored RubyFileStat to make use of it.
Dmitry Ratnikov
committed