Disable DfsIter and BfsIter until bug rust-lang/rust#22841 is fixed

https://github.com/rust-lang/rust/issues/22841
4 files changed
tree: 9c6860cb25142158c2d274c1bfbc258c942bc23b
  1. benches/
  2. src/
  3. tests/
  4. .travis.yml
  5. Cargo.toml
  6. README.rst