Merge pull request #14 from Ogeon/master

std::rt::io has moved to std::io
Remove all uses of managed boxes.
Merge pull request #15 from eddyb/no-managed

Remove all uses of managed boxes.
Updated to current Rust master (no do for closures).
Merge pull request #16 from eddyb/update-for-master

Updated to current Rust master (no do for closures).