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
remove broken symlink
Remove database steps in DEVELOPER-ADVANCED.md
FEATURE: advanced search help
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FEATURE: added status:noreplies and status:archived to advanced search
FEATURE: in:likes and in:posted search filters
FEATURE: in:tracking and in:watching search filters
FEATURE: order:views order by views
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multiple lines of post-actions smushed on mobile
mobile emails, use 100% / auto img sizing
mobile "new/updated topics"  alert was too small
reorganize site settings a bit