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

* Update substrate git version

* Fix wasm compile

* Implement GetNodeBlockType and GetRuntimeBlockType for Runtime

* Mark runtime as public

* Path fixes

* Fix transaction pool definition

* Fix metadata and service component type updates

* Fix genesis and queue compile

* Fix cli compile

* Update substrate version

* Fix ssz compile

* Fix runtime compile

* Fix std utils compile

* Fix service compile

* Fix ssz hash tests

* Remove Travis CI

* Implement ssz merkle root function

* Implement object hash function

* Add a hash-derive implementation

* Implement spec_hash for Vec

* Move type parameter to fn

* Integrate ssz_hash into runtime

Thanks Paul!

The former claimed to have built on blake2-rfc, so I assume it's newer, and it indeed has a nicer interface.

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`.