* Optimize hash comparison

* Use libc

* Introducing ValidSignedTransaction

* Verifiying transactions in engines

* Widening use of VerifiedSignedTransaction

* Renaming Transactions

* Uncommenting banning queue & Fixing tests

* Fixing json tests

* Fixing pre-homestead test

* Fixing imports

* Addressing grumbles

* Fixing test

* Bumping serde & serde_json

* Super-initial usage of new jsonrpc

* Single event loop for jsonrpc

* Metadata

* Supporting metadata extraction for eth_accounts

* Fixing Cargo.lock

* Removing uneccessary clones

* Fixing unused import

* Unused import

* Fixing test