Added attr tests to U2Demo.
Added attr tests to U2Demo.

jlhughes/foam,foam-framework/foam,foam-framework/foam,mdittmer/foam,jlhughes/foam,jacksonic/foam,foam-framework/foam,mdittmer/foam,foam-framework/foam,jacksonic/foam,mdittmer/foam,jlhughes/foam,foam-framework/foam,jlhughes/foam,jacksonic/foam,mdittmer/foam,jacksonic/foam