ged-odoo

<?xml version="1.0" encoding="utf-8"?>
<openerp>
    <data>
        <template id="assets_backend" name="custom assets" inherit_id="web.assets_backend">
            <xpath expr="." position="inside">
                <link rel="stylesheet" href="/custom_stuff/custom.css"/>
            </xpath>
        </template>
    </data>
</openerp>

ged-odoo

{
    'name': 'Custom Settings for Odoo',
    'category': 'Custom',
    'description': """
Custom Settings for Odoo
""",
    'version': '1.0',
    'data' : [
        'view.xml',
    ]