add receiving

new file on

db/
-crate_table_receiving

web/application/
- controllers/receiving.php
-helpers/receiving.php

alter file on
web/application/controllers/
-retail.php
web/application/helper/
-retail_ajax.php
-generate_code.php

web/application/views/retail/receiving/
- html.php
-js.php
Merge branch 'master' of https://github.com/cresenity/capp