Optimize user csv export
use android 5.0 emoji set + optimize PNGs
FIX: semantic HTML for category with images
FEATURE: Load fewer topics in the topic list on slow platforms (Android)
Merge pull request #3039 from techAPJ/patch-1

Optimize user csv export
FIX: If a user uses the keyboard to navigate, don't bubble up the event.
Fixes broken test
FIX: Don't raise an error when trying to log nothing
FIX: registration fails with timeout on gravatar
changing font sizes to ems, so fonts scale a bit more gracefully
Merge pull request #3044 from awesomerobot/master

changing font sizes to ems, so fonts scale a bit more gracefully
minor font sizing CSS fixups
setting static base font size
Merge pull request #3047 from awesomerobot/master

setting static base font size
FIX: automatically use uploaded avatar when uploading an avatar