Added kmessagewidget from subsurface project

(https://github.com/torvalds/subsurface, commit:
82a946152b7f1da177344937acbc9d3cb5b0ccbf).
Added MessageWidget class.

src/gui/MessageWidget.cpp

@@ -0,0 +1,49 @@
+/*
+ *  Copyright (C) 2015 Felix Geyer <devel@pgalves.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 2 or (at your option)
+ *  version 3 of the License.
+ *
+ *  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 "MessageWidget.h"
+
+MessageWidget::MessageWidget(QWidget* parent)
+    :KMessageWidget(parent)
+{
+
+}
+
+void MessageWidget::showMessageError(const QString& text)
+{
+    showMessage(text, MessageType::Error);
+}
+
+void MessageWidget::showMessageWarning(const QString& text)
+{
+    showMessage(text, MessageType::Warning);
+}
+
+void MessageWidget::showMessagePositive(const QString& text)
+{
+    showMessage(text, MessageType::Positive);
+}
+
+void MessageWidget::showMessage(const QString& text, MessageType type)
+{
+    setMessageType(type);
+    setText(text);
+    animatedShow();
+}
+
+
+