Pull Requests:
- Refactor registry data sync (#301, #300)
- Change indices fetching to work synchronously in addition to async (#303, #305)
- Fix gorountines leak (#302)
Configuration changes:
CLEAN_REGISTRY_DATA
- added a flag to force resyncETH_1_SYNC_OFFSET
- sync offset (the block to start the sync from) will be applied only when no persisted value exist. in case of resync the default value is the contract genesis block