resolve() now croak()s instead of die()s on non-existent file. [Danijel Tašov]
Added a traverse() method for directories, based on the fmap_cont()
method of Forest::Tree::Pure. It's an alternative to ->recurse,
which allows for more control over how the recursion
happens. [Jesse Luehrs]Fixed a grammar error in the docs. [Shlomi Fish]