* Update `add_license` script
* run script
* add `remove duplicate lines script` and run it
* Revert changes `English spaces`
* strip whitespaces
* Revert `GPL` in files with `apache/mit license`
* don't append `gpl license` in files with other lic
* Don't append `gpl header` in files with other lic.
* re-ran script
* include c and cpp files too
* remove duplicate header
* rebase nit
* Add license and readme
* Use pure rust implementation
* Bump version to 0.1.1
* Don't use C, prefer the pure Rust implementation
* Add test for `write_keccak`
* Bump version
* Add benchmarks
* Add benchmarks
* Add keccak_256, keccak_512, keccak_256_unchecked and keccak_512_unchecked – mostly for compatibility with ethash
* Remove failed git merge attempt from external git repo
Cargo.lock updates
* whitespace
* Mark unsafe function unsafe
* Unsafe calls in unsafe block
* Document unsafety invariants
* Revert unintended changes to Cargo.lock
