CSS Filter: Add 'cubic-bezier' to SAFE_FUNCTIONS
CSS Filter: Add 'will-change' to SAFE_PROPERTIES

In the browsers that support it, this property will allow for GPU-accelerated animations.
CSS Filter: Add 'order' to CSS SAFE_PROPERTIES

Allow the order property for sorting flex items
Plug several leaks of (username, flair) pairs for deleted users

Thanks to /u/rotorcowboy for the report!