Update to futures 0.2.1

This is a re-re-re-revert of 7ae804.
This repo has been pinned in garnet. The version of garnet with the
pinned third_party/rust-crates has successfully rolled up to topaz,
so this can land safely at long last :)

Change-Id: Ia35ec2f13e4aabcf11d21d32b722c547b2407875
561 files changed
tree: 706d2d76434ee7b59b24da5f4ed8ea698f531adb
  1. .vendor-update.stamp
  5. README.md
  6. vendor/

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