Fix bugs 430, 426, 429, 394, 433.

These bugs are about QApplication instance being destroyed  before
some QObject.

Reviewer: Luciano Wolf <luciano.wolf@openbossa.org>
          Renato Araújo <renato.filho@openbossa.org>

tests/QtUiTools/bug_426.py

@@ -0,0 +1,18 @@
+import sys
+import os
+from PySide import QtCore, QtGui
+from PySide.QtUiTools import QUiLoader
+
+class Window(object):
+    def __init__(self):
+        loader = QUiLoader()
+        filePath = os.path.join(os.path.dirname(__file__), 'bug_426.ui')
+        self.widget = loader.load(filePath)
+        self.group = QtGui.QActionGroup(self.widget)
+        self.widget.show()
+        QtCore.QTimer.singleShot(0, self.widget.close)
+
+if __name__ == "__main__":
+    app = QtGui.QApplication(sys.argv)
+    win = Window()
+    sys.exit(app.exec_())