Expand Cargo.toml for crates.io.
Update for d9c7c00b9 2014-12-04 21:33:07 +0000.
Update version/licenses for cargo.
Remove some underscores due to enum namespacing.
Remove unnecessary exclude.
Make benchmarking run faster by being lazier.

No need to convert to a string so eagerly, so lets avoid that. This just
reduces the amount of set-up a little to make the bench harness take
less time, it shouldn't affect the actual benchmark.
Update to 636663172 2014-12-28 16:21:58 +0000.