The layout activity was too complicated a solution for hiding columns.
Replaced with a full-size top layout panel when a full width display is
needed. 

Also included show/hide column methods to allow discrete manipulation.
Fixed problem where top of panel was rendering beneath top nav.
Simplified view injection by implementing view selector in injector.
Re-wired welcome page to render in top, full-width panel.
Initial draft of SearchResults view
Modified to enable hamcrest. Still having problems with GWTMock and
Hamcrest. Opened issue in GWTMock git.