Created PySide cleanup functions used to register functions to be called before the python die.

Reviewer: Hugo Parente Lima <hugo.pl@gmail.com>
          Luciano Wolf <luciano.wolf@openbossa.org>

libpyside/pyside.h

@@ -75,6 +75,15 @@ template<typename T>
 struct initQtMetaType<T, false> {
 };
 
+
+typedef void (*CleanupFunction)(void);
+
+/**
+ * Register a function to be called before python die
+ */
+PYSIDE_API void registerCleanupFunction(CleanupFunction func);
+PYSIDE_API void runCleanupFunctions();
+
 } //namespace PySide