class Opal::Hike::Trail

index.find "test_trail"
index.find "hike/trail"
index = trail.index

searching, `index` will avoid excess system calls.
confident that you are not making changes the paths you are
does not update when the file system changes. If you are
interface as `Trail`. An `Index` is a cached `Trail` object that
`Trail#index` returns an `Index` object that has the same

def index
  Index.new(root, paths, extensions)
end