FEATURE: show full name in emails
separate site setting for showing full name in emails
improve copy to reduce confusion
Merge pull request #2897 from techAPJ/patch-1

FEATURE: show full user name in emails
yet another attempt at images in email
improve email bounce reply copy
better email bouncy reply titles
FIX: respect anon_polling_interval
FIX: only poll background message bus pages once a minute
FEATURE: background_polling_interval
FEATURE: long polling pushed back to 25 seconds
FEATURE: force a poll when a bg page returns to foreground

also improve copy of message bus settings a bit
slow down rate we flush timings on posts we already know we read (10 instead of 5)
PERF: stop using jQuery to sanitize strings
correct spec
PERF: unbind some stuff to speed up topic list
remove unused code
increase click area on editor toggle
increase click area on editor toggle, mobile
tighten up draft display on mobile
unbound if is not a perf gain
FIX: add 'Content-Length' header for avatars
FIX: The whole page was a drag-n-drop target even when there were
multiple file upload components.
FIX: add vary encoding to gzip responses

this ensures CDNs work correctly see: http://blog.maxcdn.com/accept-encoding-its-vary-important/