Permissions table not responsive.

[klonos]

@quicksketch #900 (comment)

I found that the responsiveness of this table isn't so great on mobile. But we have similar problems on the full permissions page anyway, so I don't think that should hold up the show here.

Well, a year+ later, here's an issue for it 😉

There's 3 places this will need to be fixed in:

admin/config/people/permissions
admin/structure/types/add#edit-permissions
admin/structure/types/manage/%node_type%/configure#edit-permissions

The table is worse in the content type add/edit form where it's placed inside the vertical tabs and its width is limited. Here's how that looks with progressively smaller widths:

[klonos]

...this is part of #516