[MERGE] new module: website_forum_doc + small fixes (close) in forum

addons/website/static/src/css/editor.css

addons/website/static/src/css/editor.sass

addons/website_forum/controllers/main.py

addons/website_forum/models/forum.py

addons/website_forum/static/src/css/website_forum.css

addons/website_forum/static/src/css/website_forum.sass

addons/website_forum/static/src/js/website_forum.js

addons/website_forum/views/website_forum.xml

addons/website_forum_doc/__init__.py

addons/website_forum_doc/__openerp__.py

addons/website_forum_doc/controllers/__init__.py

addons/website_forum_doc/controllers/main.py

addons/website_forum_doc/data/doc_data.xml

addons/website_forum_doc/data/doc_demo.xml

addons/website_forum_doc/models/__init__.py

addons/website_forum_doc/models/documentation.py

addons/website_forum_doc/security/ir.model.access.csv

addons/website_forum_doc/views/doc.xml

addons/website_forum_doc/views/website_doc.xml