* ssz, ssz-derive: publish v0.1.1

* Remove keccak-hasher dependency

* [WIP] Reverse dependency for serenity crate

* Rename serenity to beacon

* Introduce with-codec and with-serde features for beacon

* Fix all compile due to interface changes

* Add description and license for beacon crate

* Update beacon version

* Commit cargo lock

* Add yamltests tool for running yaml state tests

* deny_unknown_fields for state

* Add deny_unknown_fields for all structs

* Do not use serde derive feature

* Remove derive feature from yamltests

* Refactor slot generic

* Fix consts

* Revert "Refactor slot generic"

This reverts commit 39d0a539.

* [WIP] serenity tidy up

* Unify ssz and ssz-hash

* Remove unused ssz-hash and ssz-hash-derive crate

* Implement deposit handling

* Fix compile

* Decouple committee and randao

* Make randao and committee encodable

* Add randao storage to runtime

* Add randao onion implementation

* Finish randao integration

* [WIP] update runtime to newest version

* Port crypto to edition 2018

* Port everything else and make it compile

* Fix start_time

* Fix compile

* Move DigestItem to a separate mod

* CompatibleExtrinsic trait

* Expose API for validator id from attestation

* CompatibleExtrinsic impl

* Save and load latest attestations

* note_block for LatestAttestation

* Expose last finalized/justified slot from runtime

* Implement LMD-GHOST's is_new_best

* Update substrate reference

* Finish LMD-GHOST integration

* Remove old unused lmd-ghost crate

* README: LMD-GHOST is integrated

But note that this is incorrect according to eth2.0-specs BLS definition. It should be 48 bytes (and it's a G1, not G2).

* Init lmd-ghost crate

* Add H384 primitive

* Rename primitives -> shasper-primitives

* Implement justified head

* Finish a draft implementation of lmd-ghost

* Add docs for lmd-ghost

* Add license header for primitives

Thanks Paul!

Lighthouse's ssz depends on `ethereum-types`, while we need to use `substrate_primitives`, so we can't yet directly
reference it on `crates.io`.