Fiddler extension for inspecting the OAuth token used in SharePoint 2013+

This project is the source repository for the work by Kirk Evans as documented on his blog post here: http://blogs.msdn.com/b/kaevans/archive/2013/08/25/creating-a-fiddler-extension-for-sharepoint-2013-app-tokens.aspx

Kirk asked me to post this to GitHub for the community.