subscriber: renamed to GcalSubscriberView

This is more of a semantic change than anything else. GcalSubscriber
will gradually take on GcalView interface and that's why I'm adding the
View suffix.

src/gcal-subscriber-view-private.h

@@ -17,14 +17,14 @@
  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef __GCAL_SUBSCRIBER_PRIVATE_H__
-#define __GCAL_SUBSCRIBER_PRIVATE_H____
+#ifndef __GCAL_SUBSCRIBER_VIEW_PRIVATE_H__
+#define __GCAL_SUBSCRIBER_VIEW_PRIVATE_H____
 
 #include <glib.h>
 
 G_BEGIN_DECLS
 
-struct _GcalSubscriberPrivate
+struct _GcalSubscriberViewPrivate
 {
   /**
    * Hash to keep children widgets (all of them, parent widgets and its parts if there's any),
@@ -56,4 +56,4 @@ struct _GcalSubscriberPrivate
 
 G_END_DECLS
 
-#endif /* __GCAL_SUBSCRIBER_H__ */
+#endif /* __GCAL_SUBSCRIBER_VIEW_PRIVATE_H____ */