Arvados » Arvados Workbench 2

As a user I would like to choose a workflow
so that I will know which type inputs needs to be selected

Acceptance criteria:
- functions available in step 1
- iframe with list of workflows (private, public and shared)
- tabs with workflow description and inputs (description is presented after selecting a workflow)
- buttons next and canceled

Mockup: https://3czrf1.axshare.com/#g=1&p=7_2_run_a_process&c=1

User flow:

1. Click on "New" button

2. Choose "Process"

3. Choose a workflow

4. Click "Next" button