web_context_tunnel v8 port: asset bundle + tests

ported web_context_tunnel to v8:
wrapped into asset bundle and updated qunit tests to get it green
(well there are some qunit tests errors in the core but it's absolutely unrelated to my module; you could see these fail on runbot here http://17194-8-0-d9e72a.runbot6.odoo.com/web/tests )