Update to 8.2.0

Changelog:
Version 8.2.0 October 20th 2015
Major new ownCloud release, more info in announcement blog. Summary:

    Updated design
    New sidebar
    Rewritten Gallery app
    Updated text editor
    Notifications
    Policy for retaining deleted files and file versions
    Encrypt/decrypt commands
    Many additions to occ command tool for admins
    Improved mime type handling
    Security Hardening
    ownCloud API work: Modular Authentication support, Capabilities Manager and Query Builder and more
    Many small improvements

(ryoon)