Hooked GcalYearView into GcalWindow and GcalApplication.

This works amost flawlessly since GcalView interface and it's methods
take care of almost everything.
Yet, this made me realize some toolbar bug.

src/gcal-application.c

@@ -194,6 +194,7 @@ gcal_application_set_app_menu (GApplication *app)
   view_as = g_menu_new ();
   g_menu_append (view_as, _("Weeks"), "app.view::week");
   g_menu_append (view_as, _("Months"), "app.view::month");
+  g_menu_append (view_as, _("Years"), "app.view::year");
 
   g_menu_append_section (app_menu, _("View as"), G_MENU_MODEL (view_as));
 

src/gcal-window.c

@@ -21,6 +21,7 @@
 #include "gcal-manager.h"
 #include "gcal-floating-container.h"
 #include "gcal-toolbar.h"
+#include "gcal-year-view.h"
 #include "gcal-month-view.h"
 #include "gcal-week-view.h"
 #include "gcal-view.h"
@@ -609,7 +610,10 @@ gcal_window_set_active_view (GcalWindow         *window,
           case GCAL_WINDOW_VIEW_MONTH:
             priv->views[GCAL_WINDOW_VIEW_MONTH] = gcal_month_view_new ();
             break;
-          default:
+        case GCAL_WINDOW_VIEW_YEAR:
+          priv->views[GCAL_WINDOW_VIEW_YEAR] = gcal_year_view_new ();
+          break;
+        default:
             g_debug ("Unimplemented view yet");
             return;
         }