Cmis write

Port of https://code.launchpad.net/~savoirfairelinux-openerp/knowledge-addons/cmis_write/+merge/213940 by @ehdem 

**Depends on #6**

Add cmis_write: It allows to create docs from OE in DMS

LP reviews
--------------
* @max3903: Approve on 2014-04-19
* @bwrsandman: Needs Fixing on 2014-05-06

    > No unittests
Flake8: `F401 'ConnectorSession' imported but unused`