`user_can` function built for Jinja template contexts should check
application, portfolio, and atat level permissions depending on what
resources are available on `g`.
A `before_request` hook queries the database for portfolios, requests,
and task orders based on the route arguments. The resources are added as
attributes on `g`. The portfolio context processor and the access
decorator now rely on those resources being available on `g`.
WIP: find major resources in before_request hook, apply to g
WIP: use g.portfolio for portfolio context processor
WIP: the access decorator should rely on the resources being available on g
