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

Conflicts:
- .github/ISSUE_TEMPLATE/bug_report.md
  Took our version.
- CONTRIBUTING.md
  Updated the embedded copy of upstream's version.
- README.md
  Took our version.
- app/policies/status_policy.rb
  Not a real conflict, took code from both.
- app/views/layouts/embedded.html.haml
  Added upstream's changes (dns-prefetch) and fixed
  `%body.embed`
- app/views/settings/preferences/show.html.haml
  Reverted some of upstream changes, as we have a
  page dedicated for flavours and skins.
- config/initializers/content_security_policy.rb
  Kept our version of the CSP.
- config/initializers/doorkeeper.rb
  Not a real conflict, took code from both.

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 2018_10_07_025445) do
+ActiveRecord::Schema.define(version: 2018_10_18_205649) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -22,6 +22,7 @@ ActiveRecord::Schema.define(version: 2018_10_07_025445) do
     t.bigint "status_ids", default: [], null: false, array: true
     t.bigint "last_status_id"
     t.integer "lock_version", default: 0, null: false
+    t.boolean "unread", default: false, null: false
     t.index ["account_id", "conversation_id", "participant_account_ids"], name: "index_unique_conversations", unique: true
     t.index ["account_id"], name: "index_account_conversations_on_account_id"
     t.index ["conversation_id"], name: "index_account_conversations_on_conversation_id"
@@ -195,6 +196,7 @@ ActiveRecord::Schema.define(version: 2018_10_07_025445) do
     t.datetime "updated_at", null: false
     t.integer "severity", default: 0
     t.boolean "reject_media", default: false, null: false
+    t.boolean "reject_reports", default: false, null: false
     t.index ["domain"], name: "index_domain_blocks_on_domain", unique: true
   end
 
@@ -311,6 +313,7 @@ ActiveRecord::Schema.define(version: 2018_10_07_025445) do
     t.datetime "created_at", null: false
     t.datetime "updated_at", null: false
     t.bigint "account_id"
+    t.boolean "silent", default: false, null: false
     t.index ["account_id", "status_id"], name: "index_mentions_on_account_id_and_status_id", unique: true
     t.index ["status_id"], name: "index_mentions_on_status_id"
   end