* fix: ancestorQuery should never return None

* fix: lmd-ghost error types unification

* Make lmd-ghost properly set head

* Implement JustifiableExecutor for beacon block struct

* Replace BestDepthImporter with ArchiveGhostImporter

* Create archive lmd-ghost impl for simplicity

* Add blockchain executable directly built on top of libp2p

* Fix tests

* [WIP] Update all config and struct definitions

* [WIP] Utils function spec update I

* [WIP] Utils functions spec update II

* [WIP] Re-init beacon

Cherry-pick back old code rather than modifying it is easier to do -- as there are many changes.

* [WIP] Cherry-pick back all types

* [WIP] Cherry pick back all helpers

* [WIP] Cherry-pick back validator status helpers

* [WIP] Migrate back per epoch helpers

* [WIP] Cherry-pick justification and finalization

* [WIP] Redo crosslink and rewards

* [WIP] Cherry-pick back all per epoch operations

* [WIP]

* [WIP] Port back all operations

* Add state root verification

* [WIP] Fix warnings

* Finish fixing all warnings

* Add function to execute block

* Add back small config

* Add new test repo

* Update yamltests for the new format and pass those tests

* Check block state root in execute_block

* Add full tests

* Update tests

* Add back block builder

* Fix other crate compile

* Make beacon crate work again in no_std

* beacon: UnsealedBeaconBlock

* Upgrade blockchain to 0.5.1

* Simple interface to blockchain

* Add block builder interface

* All basic ops for hashing using Digest interface

* Add support for digestible in ssz-derive

* Add Digestible interface for beacon crate

* Fix all missing docs in ssz

* Add docs for all beacon structs

* Update version

* 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

* Implement use_fixed attr so that FixedVec can be hidden

* Fix yamltests and fix missing use_fixed in hash derive

* Make sure all tests are checked and fix an issue in slot progression

* Fix an overflow issue and flush stdout when running tests

* Add parameter to allow only running one test

* Fix epoch overflow and an issue related to effective balance

* Add test for permuted_index

* Fix a bug in beacon block index calculation

* Fix an issue in attestation inclusion

* Fix missing logic for handling deposit

* Shouldn't use wrapping

* Fix an issue in ssz and bitfield

* Add test for basic header serialization

* Fix serialization issue in beaconstate

* Make some tests to pass

* Comment out deposit_count for now

Test states it does not exist at this moment, while spec disagrees

* Ignore genesis block test because test/spec difference

* 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

* Move from zcash's crypto to signature-schemes

* Make secret making accept secrets of any length

* Make serenity crate use amcl crypto

* Add new uint tests

* Check deserialization for uint

* Align ssz to the newest dev spec

* Fix derive for new spec

* Check in prefixable

* Chunkify

* Add test for chunkify

* Add merkleize and tests

* Add bytes impl for hash

* Add tuple tests

* Fix derive hashing

* Add description for ssz and ssz-derive

* Remove debug println

* Fix build

* Add version for ssz

* Fix whitespace typo

* Fix breakage due to nightly 2019-03-18

* Remove rust toolchain file

* 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

* Clean up substrate primitive dependencies for shasper primitive types

* Fix import in shasper consensus

* Move proposer selection to runtime

* Verify randao commitment

* Commit wasm binary changes

* Decouple committee and randao

* Make randao and committee encodable

* Add randao storage to runtime

* Add randao onion implementation

* Finish randao integration

* [WIP] support multiple validators in an attestation and rework runtime

* [WIP] More fixes to nostd and basic new AttestationRecord

* [WIP] finish runtime integration

* [WIP] Fix deps

* [WIP] some compile fixes

* Make consensus compile

* Make everything compile

* Fix authoring

* Fix doctest complain

* [WIP] update runtime to newest version

* Port crypto to edition 2018

* Port everything else and make it compile

* Fix start_time

* Fix compile

* Update bls version

* Re-introduce aggregate signature support

* 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

* Switch to own DigestItem impl

* Fix consensus compile

* H256 -> Self::Hash