Back office: fix bug in update restaurant function (deleting  ImageData)
Preview.cshtml: Add screen in restaurant with no dishes
AddDish
Merge branch 'master' of https://github.com/pashkov/Spontaneous

Conflicts:
	diabetes/Spontaneous.MobileWebApp/Controllers/RestaurantController.cs
	diabetes/Spontaneous.MobileWebApp/Spontaneous.MobileWebApp.csproj
EditDish: view image size fix