* Rename `hashing` crate to `eth2_hashing`
* Add license, desc to eth2_hashing Cargo.toml
* Remove merkle root from eth2 hashing
* Remove old benches folder (zombied from old branch)
* Add docs to eth2_hashing
* Prepare tree_hash for publishing on crates.io
* Update deps to use crates.io instead of paths
* Update all crates to pull ssz from crates.io
* Remove cached_tree_hash, add patches to manifest
* Fix compile error in benches
* Remove unused code
* Fix fake_crypto compile error
* Replace deposit signatures with SignatureBytes, a struct which lazyly parsers signatures only on demand.
* check byte length when parsing SignatureBytes
* add comment to struct
* distinguish BadSignature and BadSignatureBytes in verify_deposit_signature
* add test for valid signature
* Implements TryInto<Signature> for &SignatureBytes and From<Signature> for &SignatureBytes
* add and use PublicKeyBytes + fix formatting
* fix compiler warning + docs for macro generated structs
* adds tests to ensure correct byte lengths
* small style improvement as suggested by michaelsproul
- Adds a new-type wrapper for `AggregatePublicKey`, just like all the
other types.
- Adds the `verify_multiple` method to the `AggregateSignature` newtype,
as was introduced in a recent version of signature-schemes.
