Add title bar to each workbench element
Collapse/show control for workbench controls
Merge pull request #89 from Kitware/workbench-collapse-controls

Workbench collapse controls
Restyle workbench header, use dropdown for layouts
Make empty state for workbench elements more obvious
Instructional UI for initial workbench state
Use same mixin between different layout container templates
Merge pull request #90 from Kitware/layout-dropdown

Layout dropdown
Add more layouts

We were lacking a 2-element layout, and a 3-element layout.
Merge pull request #91 from Kitware/more-layouts

Add more layouts
Modal control selection behavior within workbench cells
Merge pull request #92 from Kitware/workbench-control-selection

Modal control selection behavior within workbench cells
Merge branch 'master' into make-search-work
Style fixes to satisfy jshint.