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.

db/migrate/20180628181026_create_custom_filters.rb

@@ -0,0 +1,13 @@
+class CreateCustomFilters < ActiveRecord::Migration[5.2]
+  def change
+    create_table :custom_filters do |t|
+      t.belongs_to :account, foreign_key: { on_delete: :cascade }
+      t.datetime :expires_at
+      t.text :phrase, null: false, default: ''
+      t.string :context, array: true, null: false, default: []
+      t.boolean :irreversible, null: false, default: false
+
+      t.timestamps
+    end
+  end
+end

db/migrate/20180707154237_add_whole_word_to_custom_filter.rb

@@ -0,0 +1,17 @@
+require Rails.root.join('lib', 'mastodon', 'migration_helpers')
+
+class AddWholeWordToCustomFilter < ActiveRecord::Migration[5.2]
+  include Mastodon::MigrationHelpers
+
+  disable_ddl_transaction!
+
+  def change
+    safety_assured do
+      add_column_with_default :custom_filters, :whole_word, :boolean, default: true, allow_null: false
+    end
+  end
+
+  def down
+    remove_column :custom_filters, :whole_word
+  end
+end