Import feature for following/blocking lists (addresses #62, #177, #201, #454)

db/migrate/20170330163835_create_imports.rb

@@ -0,0 +1,11 @@
+class CreateImports < ActiveRecord::Migration[5.0]
+  def change
+    create_table :imports do |t|
+      t.integer :account_id, null: false
+      t.integer :type, null: false
+      t.boolean :approved
+
+      t.timestamps
+    end
+  end
+end

db/migrate/20170330164118_add_attachment_data_to_imports.rb

@@ -0,0 +1,11 @@
+class AddAttachmentDataToImports < ActiveRecord::Migration
+  def self.up
+    change_table :imports do |t|
+      t.attachment :data
+    end
+  end
+
+  def self.down
+    remove_attachment :imports, :data
+  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: 20170330021336) do
+ActiveRecord::Schema.define(version: 20170330164118) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -93,6 +93,18 @@ ActiveRecord::Schema.define(version: 20170330021336) do
     t.index ["account_id", "target_account_id"], name: "index_follows_on_account_id_and_target_account_id", unique: true, using: :btree
   end
 
+  create_table "imports", force: :cascade do |t|
+    t.integer  "account_id",        null: false
+    t.integer  "type",              null: false
+    t.boolean  "approved"
+    t.datetime "created_at",        null: false
+    t.datetime "updated_at",        null: false
+    t.string   "data_file_name"
+    t.string   "data_content_type"
+    t.integer  "data_file_size"
+    t.datetime "data_updated_at"
+  end
+
   create_table "media_attachments", force: :cascade do |t|
     t.bigint   "status_id"
     t.string   "file_file_name"