Auto-anchor attribute regexes, document _validTags
FIX: Use lang- prefixes for HLJS; add nohighlight for ...

text; use a proper whiteListTag() call.

Old posts are not affected - no global rebake is necessary.
Clean up validateAttribute() function

Remove code duplication
FEATURE: Allow explicit rel="nofollow" on links
Fix JSHint
Fix data-* behavior (failure to understand own docs)
Update Markdown tests
Add emoji pl_PL localization
Remove href attribute from tab link to prevent duplicate event on enter.

Because Discourse doesn't preventDefault on links with an href of "#"
this tab-able link was firing a click event when enter was pressed. This
had the unfortunate side effect of breaking the history, making routing
and navigation unreliable.
Add additional fields that indicate reply

When scanning for where a reply starts, three lines in a row matching common email reply headers indicate the start of a reply. Add 'Cc', 'Bcc', and 'Date' because these are also common.
FEATURE: search by ip address on admin user list page
fix size of quote avatars in email
FIX: When uncategorized badge is not suppressed, the header formatting
was a bit messed up
Merge pull request #2902 from techAPJ/patch-1

FEATURE: search by ip address on admin user list page
FIX: Broken "read more" link on categories view for mobile pinned topics
FEATURE: Include category / subcategory name in document title when
viewing a topic.
FIX: disposable invite was giving email validation error
Merge pull request #2905 from techAPJ/patch-3

FIX: disposable invite was giving email validation error
make sure categories don't wrap in email digests
Moderators can search users by ip address