2.0.0
* Support and test on Ruby 1.9.3 and later.
* Switch to minitest.
* Rename `Trail#index` to `Trail#cached`.
* Replace find with block api with find_all.
2.1.0
* Extract duplicated stat and entries functions
Also avoid creating excess Pathname objects we don't need to.
2.1.1
* Reduce Pathname usage for performance.
2.1.2
* entries and stat path argument is already a String
* Precompute reverse alias map
* Use hash default proc for cache fetching
2.1.3
* Add Rubinius to Build Matrix with Allowed Failure
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