[10.0] web_environment_ribbon forward port

[MIG][web_editor_background_color] Migrate to v10

Now it fits into upstream's color picker, just adding a new tab at the end.

All known issues have been addressed.

* [ADD][web_editor_background_color] Custom background color picker

This addon lets the user choose a preferred background color when editing some web content.

Works out of the box with `website` and `mass_mailing` addons, although requires none of those.

* [FIX] Avoid clicks removing dropdown menu

This happened specifically in Chrome as demonstrated in
https://github.com/OCA/web/pull/582#issuecomment-287057052.

* [FIX] Use strict equality operator.

[FIX] Bad setup file for version 10.0

* [ADD] .eggs in gitignore

* [IMP] Web Environment Ribbon: add backend
This commit adds a simple bakend to facilitate inheritance

* [IMP] Web Environment Ribbon: add the databse name
This commit adds the database name under the ribbon name, in the ribbon

* [IMP] Web Environment Ribbon: prepare method for ribbon name

* [IMP] README: explain how to use db_name

[MIG]migrate web_widget_image_webcam v10

[10.0] [MIG] web_timeline

[10.0][MIG]migrate web_widget_image_download

Migration of web_tree_dynamic_colored_field to 10.0

demo view

support color_field attribute

update manifest

higher version number bump

typo