* first commit, remote att types
* no more agg attestation proto
* regen mock
* only attestations
* proto
* att process
* fix att references
* more tests passing
* use att protos
* complete
* change visibility
* use gogoprotobu
* implementing basic proposer functionality
* checked in gomocks
* fix typo
* refactor using feeds
* use event feeds for assignment
* sending the latest beacon block over announcement chan
* 100 coverage, using feeds
* gazelle
* include parent hash from prev canonical block and slot number + 1
* including all other prop fields
* fix build
* proposer rpc method tests, implemented in beacon chain side
* godoc