[FIX] website_sale: displayed price doesn't change for 'List View of Variants' customize template
[FIX] product: Even when the product template has more than 1 variant, the default_code is displayed.
[FIX] bus, im_chat, im_livechat : use correct session to rpc call, little refactoring of im_livechat js, and prepare js code for Odoo Support.
[FIX] base_gengo, website_gengo: groups on the gengo key.

Basically the admin group can read the gengo key. When adding website_gengo that adds the
website groups, the groups allowed to access the key are updated.

This is done because in base_gengo the website groups are not necesssarily defined. Website
is not a dependency of base_gengo.
Merge pull request #2550 from odoo-dev/8.0-fix-default_code-chm

[FIX] product: Even when the product template has more than 1 variant, the default_code is displayed.
Merge pull request #2543 from odoo-dev/8.0-fix-website_sale-list-variants-chm

[FIX] website_sale: displayed price doesn't change for 'List View of Variants' customize template