Arvados » Arvados Workbench 2

As a user I would like to see the list of private and public workflows
so that I can

Acceptance criteria:
- view contains two cards: table with workflows and description/inputs
- table contains columns: name, authorization, last modified
- card with description/inputs contain two tabs: description, inputs

Mockup: https://3czrf1.axshare.com/#g=1&p=6__workflows&c=1