[gnome-calendar/calendar-management] sources-dialog: add GPL header

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit b0197f79c87f70951e953147c6e8645a014355d1
Author: Georges Basile Stavracas Neto <georges stavracas gmail com>
Date:   Wed Jan 14 00:27:34 2015 -0200

    sources-dialog: add GPL header

 src/gcal-source-manager-dialog.c |   18 ++++++++++++++++++
 1 files changed, 18 insertions(+), 0 deletions(-)
---
diff --git a/src/gcal-source-manager-dialog.c b/src/gcal-source-manager-dialog.c
index 2828c52..7cf6ac6 100644
--- a/src/gcal-source-manager-dialog.c
+++ b/src/gcal-source-manager-dialog.c
@@ -1,3 +1,21 @@
+/* gcal-source-manager-dialog.c
+ *
+ * Copyright (C) 2015 Georges Basile Stavracas Neto <georges stavracas gmail com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
 #include "gcal-source-manager-dialog.h"
 
 struct _GcalSourceManagerDialogPrivate