* Update documentation (part 1)
* Plug-in bundles & Sandboxing
* Javascript key
* sparkle:version element over attribute changes
* <link> additions (in case Sparkle uses them to fall back on, eg update not found)
* Major upgrades
* Minimum system requirement for 2.x
* Update Sparkle 2.x paths, migration notes, code signing XPC Services
* Rename 1.x and 2.x to 1 and 2 where appropriate
* Update app cast example to use edSignature and remove Test App zip
* Update copyright to include initial release year