* core/vm: Make max_codesize only applicable post Spurious Dragon/158/155/161/170

* tests: Remove expected failure

* core: Fix flaw where underpriced locals were removed

* core: minor code cleanups for tx pool tests

Using a Timer over Ticker seems to be a lot better, though I cannot fully
account for why that it behaves so (since Ticker should be more bursty, but not
necessarily more active over time, but that may depend on how long window it
uses to decide on when to tick next)

core/vm: more benchmarks

travis, appveyor: bump Go to 1.9 stable

core, tests: implement Metropolis EIP 684

consensus, core, tests: implement Metropolis EIP 649

core/types: encode receipt status in PostState field

This fixes a regression where the new Failed field in ReceiptForStorage
rejected previously stored receipts. Fix it by removing the new field
and store status in the PostState field. This also removes massive RLP
hackery around the status field.

rlp: fix decoding long strings into RawValue types

core: add status as a consensus field in receipt

* cmd/evm, core/vm, internal/ethapi: Add 'err' to tracer interface CaptureEnd

* cmd/evm: fix nullpointer when there is no error

node: fix instance dir locking and improve error message

metrics: change MetricsEnabledFlag to be const

tests: enable Byzantium state tests for CI

Signed-off-by: NTi Zhou <tizhou1986@gmail.com>

vendor: update USB HID lib (fix macOS crash)

core/vm: implement REVERT metropolis opcode

* whisper: Fix spelling and grammar in error

* whisper: Fix grammar in comments

README: add missing full stop

missing period at line 119