* 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

James Ray authored Nov 07, 2018 and Wei Tang committed Nov 06, 2018

* Installation: git clone, bash

* cd shasper/runtime/wasm

* Add build scripts

* Add travis config

* Avoid committing wasm binary files

* Fix spec header test

* Add travis badge in README