* 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
- 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
* Move chop lump transformer test to a generic log_note_transformer_test
* Add test cases to transformer test
- cat file flip
- cat file pit vow
- deal
- dent
* Move transformer tests over to transformer factor test file
- drip drip
- drip file ilk/repo/vow
- pit file deb ceiling/ilk/stability fee
- price feeds
* Move LogNoteTransformer test into factory package and remove log specific transformer tests
* Move Transformer test into factory package and remove log event specific transformer tests
* Respond to PR comments
* 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
* 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
- Indicate that a header has been checked for logs if no logs returned
- Indicate that a header has been checked for logs when persisting a log
- Fetch headers that need to be checked based on absence of the above
- fetches logs from all three price feeds in one query
- assumes eth/usd price feed will be updated to include LogValue event
- updates transformers to run separate from header sync
