Kagesenshi: AppRepo updates.

Some updates I did on AppRepo throughout the weekend:

• Use .catalog instead of browser plugin
• Support multiple distributions
• Use icon instead of lead image
• Browse by category
• Nicer templates
• OpenID profile settings
• Categorization using PackageKit Categories list
• Screenshot gallery

Its now looking quite good, though would need a nicer search UI.

Credits to MavJS, and Exsanetol for helping me up to add some more contents into AppRepo.