Merge remote-tracking branch 'origin/master' into gs-master

Conflicts:
 	.travis.yml
 	Gemfile.lock
 	README.md
 	app/controllers/settings/follower_domains_controller.rb
 	app/controllers/statuses_controller.rb
 	app/javascript/mastodon/locales/ja.json
 	app/lib/feed_manager.rb
 	app/models/media_attachment.rb
 	app/models/mute.rb
 	app/models/status.rb
 	app/services/mute_service.rb
 	app/views/home/index.html.haml
 	app/views/stream_entries/_simple_status.html.haml
 	config/locales/ca.yml
 	config/locales/en.yml
 	config/locales/es.yml
 	config/locales/fr.yml
 	config/locales/nl.yml
 	config/locales/pl.yml
 	config/locales/pt-BR.yml
 	config/themes.yml

app/javascript/mastodon/locales/en.json

@@ -138,6 +138,7 @@
   "keyboard_shortcuts.mention": "to mention author",
   "keyboard_shortcuts.reply": "to reply",
   "keyboard_shortcuts.search": "to focus search",
+  "keyboard_shortcuts.toggle_hidden": "to show/hide text behind CW",
   "keyboard_shortcuts.toot": "to start a brand new toot",
   "keyboard_shortcuts.unfocus": "to un-focus compose textarea/search",
   "keyboard_shortcuts.up": "to move up in the list",