Merge branch 'master' into glitch-soc/tentative-merge

Conflicts:
	README.md
	app/controllers/statuses_controller.rb
	app/lib/feed_manager.rb
	config/navigation.rb
	spec/lib/feed_manager_spec.rb

Conflicts were resolved by taking both versions for each change.
This means the two filter systems (glitch-soc's keyword mutes and tootsuite's
custom filters) are in place, which will be changed in a follow-up commit.

app/javascript/styles/mastodon/components.scss

@@ -725,6 +725,20 @@
   vertical-align: middle;
 }
 
+.status__wrapper--filtered {
+  color: $dark-text-color;
+  border: 0;
+  font-size: inherit;
+  text-align: center;
+  line-height: inherit;
+  margin: 0;
+  padding: 15px;
+  box-sizing: border-box;
+  width: 100%;
+  clear: both;
+  border-bottom: 1px solid lighten($ui-base-color, 8%);
+}
+
 .status__prepend-icon-wrapper {
   left: -26px;
   position: absolute;