Cmis

Port of https://code.launchpad.net/~savoirfairelinux-openerp/knowledge-addons/cmis/+merge/212258

This module allows to configure a CMIS backend in OpenERP.

LP reviews:
---------------
* @hbrunn: Approve on 2014-04-07 
* @max3903: Needs Fixing on 2014-04-24

    > @ehdem
    > l205: Can you put CMIS versions (1.0 or 1.1, not sure) ? 1.7 is a Magento version.
    > Thanks
* @bwrsandman: Needs Information on 2014-05-14 

    > Looking a lot better, still issues about the comments preceding functions which would be more useful as docstrings.
Flake8: F841 local variable 'ir_attach_obj' is assigned to but never used