Follow call on locked account creates follow request instead

Reflect "requested" relationship in API and UI
Reflect inability of private posts to be reblogged in the UI
Disable Webfinger for locked accounts

db/migrate/20161222204147_create_follow_requests.rb

@@ -0,0 +1,12 @@
+class CreateFollowRequests < ActiveRecord::Migration[5.0]
+  def change
+    create_table :follow_requests do |t|
+      t.integer :account_id, null: false
+      t.integer :target_account_id, null: false
+
+      t.timestamps null: false
+    end
+
+    add_index :follow_requests, [:account_id, :target_account_id], unique: true
+  end
+end

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: 20161222201034) do
+ActiveRecord::Schema.define(version: 20161222204147) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -69,6 +69,14 @@ ActiveRecord::Schema.define(version: 20161222201034) do
     t.index ["account_id", "status_id"], name: "index_favourites_on_account_id_and_status_id", unique: true, using: :btree
   end
 
+  create_table "follow_requests", force: :cascade do |t|
+    t.integer  "account_id",        null: false
+    t.integer  "target_account_id", null: false
+    t.datetime "created_at",        null: false
+    t.datetime "updated_at",        null: false
+    t.index ["account_id", "target_account_id"], name: "index_follow_requests_on_account_id_and_target_account_id", unique: true, using: :btree
+  end
+
   create_table "follows", force: :cascade do |t|
     t.integer  "account_id",        null: false
     t.integer  "target_account_id", null: false