Make the WorkflowView use tuskar's base template

Make our own WorkflowView that uses our base template, so that
our custom CSS and JS is included. This way the workflows look and
behave correctly when middle-clicked or when JS is disabled.

Change-Id: Iea3b831f461793ce3f41644ca1e1dbb6bab5d309
Closes-bug: #1242624
Merge "Make the WorkflowView use tuskar's base template"