Merge branch 'develop'

ethereal/assets/debugger/debugger.qml

ethereal/assets/qml/webapp.qml

ethereal/debugger.go

ethereal/flags.go

ethereal/html_container.go

ethereum/cmd.go

ethereum/flags.go

ethereum/main.go

ethereum/repl/javascript_runtime.go

ethereum/repl/js_lib.go

ethereum/repl/repl.go

ethereum/repl/repl_darwin.go

ethereum/repl/repl_linux.go

ethereum/repl/repl_windows.go

ethereum/repl/types.go

utils/cmd.go