* Upgrade geth from 1.8.15 to 1.8.18
* Update vat_tune to use shared repository methods
* Query blockchain by block hash instead of block number range
* Remove hash validation from repositories
* Fix vow flog integration test
* Update README Travis build sticker
* Update constants formatting per go fmt
* Update EthPublicKeyParser.ParsePublicKey to use discv5.PubkeyID method
* Address PR comments
* Add constants for TTL and tic for fakeHeader
* Add tic to tend transformer
* Update tests for tend
* Fix string conversion bug in fakes
* Fix tend integration tests after staging rebase
* Add tic to dent transformer
* Update dent tests
* Change integration tests to use hardcoded block timestamp
- Delete header on conflict to prompt data refresh (cascade deletes all
data associated with that block)
- Derive header hash from rpc payload rather than computing it from data
(prevents hash mismatch between blockchain and cache)
* Add method to convert values to ray or wad units
* Convert data to ray or wad for cat_file_chop_lump
* Use shared convert functions in price feed conversion
* Pull common ray/wad values into vars
* Fix after rebase with staging
* Use transformer factory for Bite
- introduces separate transformer factory for non-LogNote events
- converter includes `ToEntities` for events defined via ABI
* Updates after rebasing with staging
* Deal integration test
* Add LogIndex to CatFileChopLump to update unique constraint
* Add LogIndex to cat_file_pit_vow records
* Add integration tests for Cat.file transformers
* Add log index to Cat.file flip
* Add getSignatures command for list of signatures in constants
* Update VatTune converter's formatting of addresses
and added an integration test
* Move VatTune and PriceFeeds integration tests to a common suite
* Update VatGrab converter for address format
* Update frob converter to fix urn and ilk formatting/decoding
* Update formatting
* Update make test command and add integrationtest command
* Add integration test to travis build
* Update creating headers in integration tests to include Raw and Timestamp fields