Add missing sip file

python/gui/qgsmessagebar.sip

@@ -0,0 +1,45 @@
+class QgsMessageBar: QFrame
+{
+%TypeHeaderCode
+#include <qgsmessagebar.h>
+%End
+
+  public:
+    QgsMessageBar( QWidget *parent = 0 );
+    ~QgsMessageBar();
+
+    /*! display a widget on the bar after hiding the currently visible one
+     *  and putting it in a stack
+     * @param level is 0 for information, 1 for warning, 2 for critical
+     */
+    void pushWidget( QWidget *widget, int level = 0 );
+
+    /*! remove the passed widget from the bar (if previously added),
+     *  then display the next one in the stack if any or hide the bar
+     *  @return true if the widget was removed, false otherwise
+     */
+    bool popWidget( QWidget *widget );
+
+    //! make out a widget containing a message to be displayed on the bar
+    static QWidget* createMessage( const QString &text, QWidget *parent = 0 ) /Factory/;
+
+    //! make out a widget containing icon and message to be displayed on the bar
+    static QWidget* createMessage( const QString &text, const QIcon &icon, QWidget *parent = 0 ) /Factory/;
+
+    //! make out a widget containing title and message to be displayed on the bar
+    static QWidget* createMessage( const QString &title, const QString &text, QWidget *parent = 0 )  /Factory/;
+
+    //! make out a widget containing icon, title and message to be displayed on the bar
+    static QWidget* createMessage( const QString &title, const QString &text, const QIcon &icon, QWidget *parent = 0 ) /Factory/;
+
+  signals:
+    //! emitted when a widget was removed from the bar
+    void widgetRemoved( QWidget *widget );
+
+  public slots:
+    /*! remove the currently displayed widget from the bar and
+     *  display the next in the stack if any or hide the bar
+     *  @return true if the widget was removed, false otherwise
+     */
+    bool popWidget();
+};