Git: remote dialog improvements

* Add shortcuts
 * Add refresh button

Change-Id: Idfe5c86459d654ea75fb90542eaa4d9cc1405d33
Reviewed-on: http://codereview.qt.nokia.com/220
Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Tobias Hunger <tobias.hunger@nokia.com>

src/plugins/git/remotedialog.h

@@ -80,6 +80,7 @@ public:
 public slots:
     void refresh(const QString &repository, bool force);
 
+    void refreshRemotes();
     void addRemote();
     void removeRemote();
     void fetchFromRemote();