Merge branch 'develop' into rpcfrontier

cmd/blocktest/main.go

cmd/ethereum/main.go

cmd/mist/assets/qml/main.qml

cmd/mist/assets/qml/views/chain.qml

cmd/mist/debugger.go

cmd/mist/ui_lib.go

cmd/utils/cmd.go

core/block_processor.go

eth/backend.go

ethutil/natspec/natspec.go

ethutil/natspec/natspec_js.go

ethutil/natspec/natspec_test.go

tests/vm/gh_test.go

vm/context.go

vm/debugger.go

vm/gas.go

vm/memory.go

vm/stack.go

vm/vm.go