Added EngineScope in order to set the target daemon in correct mode.
Added EngineScope in order to set the target daemon in correct mode.

It only affects Windows based system where different engines may be
targeted (Windows or Linux). This is partly to address Issue #111.

mariotoffia/FluentDocker,mariotoffia/FluentDocker,mariotoffia/FluentDocker,mariotoffia/FluentDocker