feat(cargo): prepare for crates.io release.
(release) 0.0.13.
(fix) Add semicolons at macro invocation sites.
(fix) Use the clone implementation for &str.
(fix) Update examples and benchmarks to remove rust-http.
(release) 0.0.14.
Merge pull request #137 from reem/crates-io-release

feat(cargo): prepare for crates.io release.