Add support for the video attribute on recordings

Signed-off-by: Wieland Hoffmann <themineo@gmail.com>
Add support for track ids

Signed-off-by: Wieland Hoffmann <themineo@gmail.com>
Simplify tests by adding a method to load and parse XML files

Signed-off-by: Wieland Hoffmann <themineo@gmail.com>
Update CHANGES

Signed-off-by: Wieland Hoffmann <themineo@gmail.com>