Git: Rework branch dialog

* Make adding new branches more discoverable
 * Make adding tracking branches more discoverable
 * Update UI

Task-number: QTCREATORBUG-4943
Task-number: QTCREATORBUG-4944
Change-Id: Idcbf5f8321a3bd04c925e33d094bb479788a7d9b
Reviewed-on: http://codereview.qt.nokia.com/588
Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Tobias Hunger <tobias.hunger@nokia.com>

src/plugins/git/branchadddialog.h

@@ -0,0 +1,36 @@
+#ifndef BRANCHADDDIALOG_H
+#define BRANCHADDDIALOG_H
+
+#include <QDialog>
+
+namespace Git {
+namespace Internal {
+
+
+namespace Ui {
+    class BranchAddDialog;
+}
+
+class BranchAddDialog : public QDialog
+{
+    Q_OBJECT
+
+public:
+    explicit BranchAddDialog(QWidget *parent = 0);
+    ~BranchAddDialog();
+
+    void setBranchName(const QString &);
+    QString branchName() const;
+
+    void setTrackedBranchName(const QString &name, bool remote);
+
+    bool track();
+
+private:
+    Ui::BranchAddDialog *m_ui;
+};
+
+} // namespace Internal
+} // namespace Git
+
+#endif // BRANCHADDDIALOG_H