Refactored to add ability to use diferent services of server, not only objects
Added basic support of reports
Removed already implemented TODO comments
Little doc added on utils
Merge branch 'master' of https://gitlab.jbm.com.ua/firemage/erp-proxy
Added ERP_Object._get_columns_info method. Bugfixes.
Added ability to browse ERP_Record's many2one fields via __obj suffix

Example:
>>> db = ERP_Proxy(...)
>>> o = db['sale.order.line']
>>> o.order_id
... [25, 'Order name']
>>> o['order_id']
... [25, 'Order name']
>>> o.order_id__obj
...  ERP_Record of ERP Object ('sale.order'), 25
>>> o['order_id__obj']
...  ERP_Record of ERP Object ('sale.order'), 25