New release 1.4.1b, works with Windows !

This new release add some bug fixes and, more interesting, it add Windows support to.

You'll need CMake 2.4.3, libjpeg 6.2 and libpng 1.2.8 to use the library.

Tests have been done with:
- Ubuntu Edgy, g++ 4.1.2
- Windows XP, MinGW 3

Feel free to post your opinion.