just in case you dont know the Mac App "Fluid" (fluidapp.com) I wanted to share it with you.
With this little tool you can create mac apps from websites. I use it for three days now for webflow, gmail and accounting. Basically it's just a browser, which runs your web app in a single window, with an icon of your choice. You're able to put your Icon in the dock also to switch between your web apps with cmd + tab.
For the use with webflow you will have to pay the 5$ in fact you'll need the full screen mode. For running webflow without problems, just set the user agent of your new app to "safari 9".
Hope, some of you'll like this hint.