Merge branch 'develop' into release/0.5.15

.gitignore

ethereal/assets/qml/wallet.qml

ethereal/ethereum.go

ethereal/flags.go

ethereal/main.go

ethereal/ui/gui.go

ethereal/ui/html_container.go

ethereal/ui/qml_app.go

ethereal/ui/ui_lib.go

ethereum/cmd.go

ethereum/ethereum.go

ethereum/flags.go

ethereum/javascript_runtime.go

ethereum/main.go

ethereum/repl.go

utils/cmd.go