Updating the spec to align with what's implemented.  - Filled the OpenAPI spec for some major functions:   - /beacon/state   - /beacon/get_finalized_checkpoint   - /beacon/state_root  - Created some new schemas in the spec, such as Shard, Checkpoint, Validator, Eth1Data, BeaconState, PendingAttestation, Crosslink
Updating the spec to align with what's implemented.
 - Filled the OpenAPI spec for some major functions:
  - /beacon/state
  - /beacon/get_finalized_checkpoint
  - /beacon/state_root
 - Created some new schemas in the spec, such as Shard, Checkpoint, Validator, Eth1Data, BeaconState, PendingAttestation, Crosslink

sigp/lighthouse,sigp/lighthouse,sigp/lighthouse,sigp/lighthouse