7.0 export partner and address

Completion of the magentoerpconnect_export_partner module to fix the export of partners and add the export of addresses.

This PR depend of this one and need to be merged after : 

* [ ] https://github.com/OCA/connector-magento/pull/33

Initial proposal on lauchpad : 
https://code.launchpad.net/~akretion-team/openerp-connector-magento/7.0-export-partner-and-address/+merge/224180
This indentation is better (avoid `\`, indent below `if`):

    if (not self.binding_record.magento_address_bind_ids and
            not self.binding_record.consider_as_company and
            self.binding_record.street):

BTW why is there a condition on `self.binding_record.street`?