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
Ok. The thing is, as my branch depend of the PR 33 where the export_dependency() is defined, I can't modify the method in this branch.
I'am gonna make a new one for this feature to merge in your branch 7.0-export-dependency+lock then.