• Fix: Ensure aliases are published when the source page is published (Karl Hobley)
• Fix: Make page privacy rules apply to aliases (Karl Hobley)
• Fix: Prevent error when saving embeds that do not include a thumbnail URL (Cynthia Kiser)
• Fix: Ensure that duplicate embed records are deleted when upgrading (Matt Westcott)
• Fix: Prevent failure when running manage.py dumpdata with no arguments (Matt Westcott)