updated to vs 2013

updated .nuget packages
update FileProtocol to comply with new RestSharp interface changes
Engine should identity Windows 8.1 correctly
fixed errors in content.xsd schema
added image attribute to framed button wrapper

also added image attribute to schema
changed framedbutton to use custom control

also implemented imagesource property
removed unused directives from solution
added LoadImageFromArchive task
added LoadImageFromArchive to schema
missed update to project file

somehow update to project file was not included in last commit.