[MERGE] forward port of branch saas-5 up to revid 587084f6

addons/email_template/email_template.py

addons/event_sale/__openerp__.py

addons/event_sale/event_demo.xml

addons/event_sale/event_sale.py

addons/event_sale/event_sale_report.xml

addons/event_sale/event_sale_view.xml

addons/event_sale/views/report_registrationbadge.xml

...te_mail_group/static/src/js/website_mail_group.snippet.js

openerp/addons/base/ir/ir_attachment_view.xml