* Allow slot clock to work on genesis
* Loose over-strict requirements for slot clock tests
* fix slots_per_eth1_voting_period
* add utils for domain serializing and deserializing
* add serde_yaml to cargo
* add tmpdir to cargo
* cargo fmt src/utils
* add YamlConfig, allowing to serialize and deserialize yaml config files
* update to v0.9.1
* Comment out local tests
* update milliseconds_per_slot for minimal
* add safe_slots_to_update_justified
* Update to v0.9.1 and add deny_unknown_fields
* Specify that max_epochs_per_crosslink is for phase1
* Remove test stubs
* Use get to avoid panicking in serde_utils
* Use ? operator instead of explicit match return