[acsone-addons][add] Mail Html Wigedt Template to manage placeholder
[CHG] review import
[mail_html_widget_template][FIX] pep8
[mail_html_widget_template][FIX] pep8
[MRG] travis fix
[mail_html_widget_template][CHG] complete test + clear comment
[mail_html_widget_template][CHG] review code
[mail_html_widget_template][CHG] code review in manifest
[mail_html_widget_template][CHG] review code in manifest
Merge pull request #7 from acsone/acsone-addons-mail_html_widget_template

[acsone-addons][add] Mail Html Wigedt Template to manage placeholder