Added license headers

cmd/ethereum/cmd.go

cmd/ethereum/flags.go

cmd/ethereum/main.go

cmd/ethtest/main.go

cmd/evm/main.go

cmd/mist/bindings.go

cmd/mist/debugger.go

cmd/mist/errors.go

cmd/mist/ext_app.go

cmd/mist/flags.go

cmd/mist/gui.go

cmd/mist/html_container.go

cmd/mist/main.go

cmd/mist/qml_container.go

cmd/mist/ui_lib.go

cmd/peerserver/main.go

cmd/rlpdump/main.go

cmd/utils/cmd.go

cmd/utils/vm_env.go

cmd/utils/websockets.go