Updates in accessibles page

[smirolo]

1. Show "accept grant" button when a Role has a grant_key.
2. Remove "From" and "To" date fields.
3. use Organization/profile cards (ref: #49 )
4. Add "Home" and "Settings" link in card to match the dropdown menu in menubar.
5. Remove "Create New" button and add a checkbox "I am a profile manager for this account" in the invite dialog modal when the profile could not be found.
   

[smirolo]

Login as brett (password: yoyo) and browse to http://localhost:8000/users/brett/roles/ for testing updates.

[knivets]

I'm not sure why should we use profile cards here -- each card will look almost identical and waste a lot of space.

[smirolo]

We don't want a user card here. We want an Organization card. User accessibles is the list of organizations accessible by a user through a role. It is the dual of the organization roles page.
We want a card that looks a bit like the menubar dropdown.