[IMP] base ir.qweb: add and update tests for the new ir.qweb

addons/web/static/lib/qweb/qweb-test-attributes.xml

addons/web/static/lib/qweb/qweb-test-global.xml

addons/web/static/lib/qweb/qweb-test-output.xml

addons/web/static/lib/qweb/qweb-test.js.html

addons/web_editor/tests/test_converter.py

openerp/addons/base/tests/test_qweb.py

openerp/addons/test_assetsbundle/tests/test_assetsbundle.py

openerp/addons/test_converter/models.py

openerp/addons/test_converter/tests/test_html.py