EIPs 155, 160, 161 (#2976)

* The front-end for each hard-fork, also EIP-160.

* Address EIP161 a/c

* Include EIP-161b

* EIP-161 part d.

* Fix test build.

* Fix one test, add another.

* Fix use of bloom & renaming.

* Initial groundwork for EIP-155

* Fix minor bug.

* Fix all tests finally.

* Rest of EIP-155.

* Add tests for EIP-155 algorithm.

Update transaction tests validation.

* Minor reformat.

* Address grumbles.

* Remove unused code.

* Fix SUICIDE gas mechanism and add consensus tests.

* Remove commented code.

* Set Frontier hardfork block number

* Fix warning.

* Transaction tests,

rpc/src/v1/helpers/errors.rs

@@ -255,6 +255,7 @@ pub fn from_transaction_error(error: EthcoreError) -> Error {
 			SenderBanned => "Sender is banned in local queue.".into(),
 			RecipientBanned => "Recipient is banned in local queue.".into(),
 			CodeBanned => "Code is banned in local queue.".into(),
+			e => format!("{}", e).into(),
 		};
 		Error {
 			code: ErrorCode::ServerError(codes::TRANSACTION_ERROR),