update flamegraph for superior flamegraphs

(add github links and easier ability to share issues)
normalize footer div on all emails
try some flag dialog copy changes
add privacy reminder to flag dialog
copyedits on upload; fix single quote
minor flag dialog tweaks
missed the "other" flag for topics
I suck at quotes, apparently
better CSS for the notify flag msg char count
minor copyedit on hidden posts
remove unnecessary <footer> tags
FIX: users can see the raw email source of their own posts
FEATURE: Added Pin/Unpin Keyboard Shortcut
Fixed typo
FIX: change the unlisted/invisible topic state only when unhiding the first post
FIX: support for underscores in URLs (when using S3 storage)
FIX: Couldn't click on avatar on private message list
FIX: proper hack to support underscores in URLs
UX: Use loading spinner on notifications
FIX: Don't use a process cache in development mode