Vaca 0.0.5

Vaca is a library to wrap the Win32 API with C++ classes. Also, it's has some extra functionalities like dockable tool bars and layout managers. This library uses templates (but not generic programming), and Boost (the Boost.Signals library is just perfect).

The new Vaca release has:
- New examples: AddressBook, AutoCompletion, BouncingBalls, ComboBoxes, DataGrids, FontMetrics, Maths, PensBrushes.
- Added ComboBox widget.
- Added Pen and Brush classes.
- Finally done (and enhanced) all the memory management.
- Added the Timer class (to control periodic tasks in milliseconds), it doesn't uses the WM_TIMER message.