- Migrate various mocks of core namespaces to shared version in `fakes` pkg
- Err on the side of making test doubles less sophisticated
- Don't pull over mocks of namespaces that are only used in example code
- Only syncs block headers (excludes block bodies, transactions, receipts, and logs)
- Modifies validation window to include the most recent block
- Isolates validation window to the variable defined in the cmd directory (blocks
have a separate variable defined in the block_repository for determining when
to set a block as final)
* Rename geth package structs to not be prefaced with package name
* No longer need to dump schema since Travis uses migrate
* Rearrange history package
* Removed double request for receipt from block rewards
* Remove Listener + Observers and Replace w/ Polling Head
* Potential Short term Issue w/ Infura (ignore these tests for now)
