Merge remote-tracking branch 'cpradio/keyboard-binding-incoming-updated-topics'

Conflicts:
	config/locales/client.en.yml
Merge branch 'master' of http://github.com/discourse/discourse
TRIVIAL: add line break before time for post navigator
Merge branch 'master' of http://github.com/discourse/discourse
FIX: Firefox j/k post navigation is inconsistent
https://meta.discourse.org/t/j-k-navigation-in-lengthy-topics/18945
Merge pull request #2728 from techAPJ/patch-3

UX: add line break before time for post navigator
Merge pull request #2729 from cpradio/firefox-kbd-post-navigation

FIX: j/k navigation for posts using Firefox
add 1GB memory change notes
minor copy updates
minor copy update, Omit Needless Words