Changed the project type to a simple class library.
Changed the Project name to SpeedySolutions.Web.OpenGraph and the package id to the same name
The OpenGraph now implements the IHtmlString interface, so it can be written directly to a Razor @ directive.
I also refactored the code that generate the html tags
Removed the OgImage, and replaced it with the OgFile and OgFileWithSize, because this name have a broader meaning.
Added all the optional properties to the OpenGraph.
It is now possible to add more than one image.
I moved the serialization code to the OpenGraphSerializer and further refactored the code.