TooL v0.2.3 Source Package Released

Notes:
TooL is ready to import images as textures, thanks to Boost and SDL_image !

Changes:
* TooL uses Boost for shared pointers (to share heavymesh and image resources)
* The window management related classes design is cleaner.
* TooL uses SDL_image to deal with image formats.

See :
http://www.boost.org/
http://www.libsdl.org/projects/SDL_image/