Final V3 Packaging and Release

[jason-roberts]

• [x] update packaging scripts
• [x] check final assembly infos, etc
• [x] manually test NuGet packages/targets locally
  • [x] Console app
  • [x] Phone 8.1 Silverlight
  • [x] Universal app 8.1 Phone
  • [x] Universal app 8.1 Store
• [x] upload new packages to NuGet
• [x] "retire" the WPF NuGet package
• [x] Check release notes include all changes
• [x] Update docs