Pandion Installer and Auto-Update Improvements

The last couple of weeks have brought major infrastructural changes to Pandion.

• Updates have been divided across three tracks: stable, beta, and development. Through beta or development versions users can enjoy new features and bug fixes before they go mainstream. This creates a tighter feedback loop between developers and users.
• Pandion includes a new dialog to manually check for updates, although of course this happens automatically too. This dialog is also used to switch update tracks.
  
  
• The updates are announced to Pandion users through an appcast feed. This feed can also be subscribed by any Atom 1.0-compatible news reader.
• The installer is now based on Windows Installer (*.msi) packages. This makes customization, deployment and maintenance easier for system administrators and has long been a popular request.
• The new installer works without administrative access and does not trigger User Access Control (UAC) warnings.
• Development now follows a continuous integration process powered by Hudson. This means a dedicated build server tracks any changes to the source code to automatically compile and package new versions. These are deployed automatically to (brave) users through the "development" update track.