Revert "rename entrances visitant_id column to barcode"

This reverts commit 14a161c3849a6036b47978b2e06ad47aa6be7ca0.
Revert "associate visitant and entrance by entrance barcode attribute"

This reverts commit f319741a0b906299818a46353fa1a988442dfb01.
Revert "permite barcode entrance param"
change type instead of barcode while testing PATCH /visitants/:barcode
use barcode as primary key in visitants table
use barcode attribute as primary key in visitant model
use barcode instead of in visitants api
run pending migrations