[IMP] mass_mailing: move code from website_mail to mass_mailing and use web_editor

addons/mass_mailing/__openerp__.py

addons/mass_mailing/controllers/__init__.py

addons/mass_mailing/controllers/main.py

addons/mass_mailing/controllers/web_editor.py

addons/mass_mailing/controllers/website.py

addons/mass_mailing/data/mass_mailing_demo.xml

addons/mass_mailing/models/mass_mailing.py

addons/mass_mailing/static/src/css/mass_mailing_editor.css

...mass_mailing/static/src/css/mass_mailing_editor_thumb.css

addons/mass_mailing/static/src/css/mass_mailing_popup.css

addons/mass_mailing/static/src/img/blocks/block_button.png

addons/mass_mailing/static/src/img/blocks/block_discount.png

...ns/mass_mailing/static/src/img/blocks/block_discount2.png

addons/mass_mailing/static/src/img/blocks/block_event.png

..._mailing/static/src/img/blocks/block_footer_copyright.png

...s_mailing/static/src/img/blocks/block_footer_seprator.png

...ass_mailing/static/src/img/blocks/block_footer_social.png

...s_mailing/static/src/img/blocks/block_footer_tag_line.png

.../mass_mailing/static/src/img/blocks/block_footer_text.png

...mass_mailing/static/src/img/blocks/block_four_columns.png