Add project backgrounds

server/db/migrations/20180721233450_create_project_table.js

@@ -5,6 +5,8 @@ module.exports.up = (knex) =>
     table.bigInteger('id').primary().defaultTo(knex.raw('next_id()'));
 
     table.text('name').notNullable();
+    table.jsonb('background');
+    table.text('background_image_dirname');
 
     table.timestamp('created_at', true);
     table.timestamp('updated_at', true);