Move account_invoice_reference from __unported__ to the root folder
Set account_invoice_reference as installable
Move the Model account.invoice in a python module with the same name
Add tests that fail to check the copy of supplier_invoice_number to
reference on create and write
Make the new test passes, the fields is named supplier_invoice_number

not supplier_invoice_reference
Migration to the new API for account.invoice
Long line
Merge pull request #52 from guewen/account_invoice_reference

Migration of account_invoice_reference