Vaca 0.0.4 released

New Vaca released. Vaca's a library to program applications for Win32 using C++ language and classes, with a good OOP approach.

News:
* 11 new examples: BoxLayouts, CommandsAlt, Curves, FreeOfLayout, Hashing, Images, MenuResource, MiniExplorer, Regions, StdCommands, SystemImageList.
* Added automatic double-buffering option.
* A lot of minor changes and fixes.