Merge pull request #2159 from zsfelfoldi/light-backend

accounts/abi/bind/backend.go

accounts/abi/bind/backends/nil.go

accounts/abi/bind/backends/remote.go

accounts/abi/bind/backends/simulated.go

accounts/abi/bind/base.go

accounts/account_manager.go

cmd/geth/main.go

cmd/gethrpctest/main.go

cmd/utils/flags.go

common/natspec/natspec_e2e_test.go

console/console_test.go

core/vm/environment.go

eth/api.go

eth/api_backend.go

eth/backend.go

eth/bind.go

eth/cpu_mining.go

eth/gasprice/gasprice.go

eth/gpu_mining.go

internal/ethapi/api.go