views: implemented :manager property

As explained before, this is only intended to keep a reference to the
GcalManager instance of the application.
Misc: fixed some documentation and whitespace issues

src/gcal-week-view.h

@@ -20,6 +20,8 @@
 #ifndef __GCAL_WEEK_VIEW_H__
 #define __GCAL_WEEK_VIEW_H__
 
+#include "gcal-manager.h"
+
 #include <gtk/gtk.h>
 
 G_BEGIN_DECLS
@@ -46,7 +48,7 @@ struct _GcalWeekViewClass
 
 GType          gcal_week_view_get_type         (void);
 
-GtkWidget*     gcal_week_view_new              (void);
+GtkWidget*     gcal_week_view_new              (GcalManager *manager);
 
 G_END_DECLS