Don't render cache json templates.
Subreddit: cleanup description in render key.
Subreddit.wrapped_cache_key: don't double add _spam.
Fix Link.num CachedVariable usage.
Printable: cache_ignore num, it's handled by replace_render.
Use CachedVariable for Printable.rowstyle.
Add reported to Wrapped render key item only when needed.
Add upvote_ratio to Printable.cache_ignore.
Delete unused Link.urlprefix.
Add should_incr_counts to Printable.cache_ignore.
Add keep_item to Printable.cache_ignore.

It's getting set by Wrapped.__getattr__.
Add fresh to Link.cache_ignore.
Exclude media_object from link render key.
Comment: Use CachedVariable for num_children.

This makes it so cached rendered templates are not invalidated
when a comment gets replied to.
Link: be selective when adding ignore_reports to render cache key.
Remove date from PromotedLink render cache key.
Link.wrapped_cache_key formatting cleanup.