* Added an additional tx state which is used to get the current nonce
* Refresh transient state each time a new canonical block is found
* Properly uninstall filters. Fixes a possible crash in RPC

Correct stack size validation for MUL, CALLDATACOPY, EXTCODESIZE, BLOCKH...

Persistent Node Key

* Implemented `eth_logs`
* Fixed issue with `filter.Find()` where logs were appended to an
  incorrect, non-returned slice resulting in no logs found

Don't print per-function testing results

Fix failing tests and speed up Travis builds