* 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
