Move EthSpec (#591)

* Allow slot clock to work on genesis

* Loose over-strict requirements for slot clock tests

* move and rename beacon_state_types to eth_spec.rs

eth2/types/src/beacon_state.rs

@@ -15,10 +15,9 @@ use tree_hash::TreeHash;
 use tree_hash_derive::TreeHash;
 
 pub use self::committee_cache::CommitteeCache;
-pub use beacon_state_types::*;
+pub use eth_spec::*;
 
 #[macro_use]
-mod beacon_state_types;
 mod committee_cache;
 mod exit_cache;
 mod pubkey_cache;

eth2/types/src/lib.rs

@@ -23,6 +23,7 @@ pub mod crosslink_committee;
 pub mod deposit;
 pub mod deposit_data;
 pub mod eth1_data;
+pub mod eth_spec;
 pub mod fork;
 pub mod free_attestation;
 pub mod historical_batch;