* Conversion between Geth Receipt and core.Receipt
* Add receipt to DB
* Insert receipts with transactions
* Update Travis CI to use dep for dependencies
* Add block categorization (is_final=)
* Add godo task for vulcanizeDB (Example of how everything could work together)
* Add unique constraint on block_number and node
* Add index on block_id for transactions_table
* Add node_id index on blocks table
* Sort transactions returned from FindBlock by tx_hash
* lowercase tx_to, tx_from like etherscan
* Update Block w/ newest Block
* Add cascading delete to blocks and transactions tables
* Add handling for new conflicting blocks
* Command line version of sliding window n behind HEAD
* The command populates up to the highest known block number
* The anticipated use case is that the listener will be running
in parallel to the populateBlocks command
* This will mean that the listener is responsible for picking up
new blocks, and the populateBlocks command is reposible for
historical blocks
* Reformat SQL statements
