adds account reference column to scans and updates the views for scans to edit and display the acount_id
creates the qsa's table, adds the paperclip function to attach files and a reference to the account table also updates the account model and qsa model to describe the relationship between the two
adds controller and view files and directory respectively also adds the index to the view
adds the show edit and update functionality to the qsas model and controller
finishes crud for qsas