Revert "Merge pull request #225 from odoo-dev/master-frontend-assets"

This reverts commit dd900408ded4ece90df5f80f36daa049bc8f0e5b, reversing
changes made to 4da882d48ffd09651b66e72a6e5c87e76d05a346.
Merge pull request #239 from odoo-dev/master-revert-bundles

Revert "Merge pull request #225 from odoo-dev/master-frontend-assets"