Added Models App, Installation Batch Installation

db/migrate/20151113131647_create_batch_installations.rb

@@ -0,0 +1,9 @@
+class CreateBatchInstallations < ActiveRecord::Migration
+  def change
+    create_table :batch_installations do |t|
+      t.integer :app_id
+
+      t.timestamps null: false
+    end
+  end
+end