added new property.
added category support to the List action.
fix existing tests.
added filtering test.
added route settings.
fixed paging link.
create nav controller.
added render action to layout view.
get categories from menu action.
added getting category test.
craeted menu partial view.
fix style for category links.
save selected category.
added test to save selected category.
hilighting the selected category.
fix paging number.
create test: category specific product counts
Merge branch 'adding-navigation-controls'