build: removed unused/faulty code

This cleaning is made in order to merge this branch into master as soon
as possible.
The implementation of GcalDayView is planned to go on the same lines as
GcalWeekView but for two days alone, so much of the code of the latter
could be reused. The approach of using shallow container and kinda
layout manager objects inside GcalDayView didn't worked that well for my
expertise at this time.

src/gcal-window.c

@@ -22,9 +22,7 @@
 
 #include "gcal-nav-bar.h"
 #include "gcal-manager.h"
-#include "gcal-floating-container.h"
 #include "gcal-view.h"
-#include "gcal-day-view.h"
 #include "gcal-month-view.h"
 #include "gcal-week-view.h"
 #include "gcal-year-view.h"
@@ -995,14 +993,6 @@ gcal_window_constructed (GObject *object)
       gtk_widget_get_style_context (priv->views_stack),
       "views");
 
-  priv->views[GCAL_WINDOW_VIEW_DAY] = gcal_day_view_new ();
-  gtk_stack_add_titled (GTK_STACK (priv->views_stack),
-                        priv->views[GCAL_WINDOW_VIEW_DAY],
-                        "day", _("Day"));
-  g_object_bind_property (GCAL_WINDOW (object), "active-date",
-                          priv->views[GCAL_WINDOW_VIEW_DAY], "active-date",
-                          G_BINDING_DEFAULT);
-
   priv->views[GCAL_WINDOW_VIEW_WEEK] = gcal_week_view_new ();
   gtk_stack_add_titled (GTK_STACK (priv->views_stack),
                         priv->views[GCAL_WINDOW_VIEW_WEEK],