[boost] [gil] ToolBox uploaded

Hi all, I finally have managed to upload the "toolbox" extension for boost::gil. The toolbox provides some helpful extension for gil that are too small to be an extension themselves. There are: * color spaces: cmyka, gray_alpha, hsl, hsv, lab, xyz * metafunctions: channel_type_to_index, is_bit_aligned, is_similar, is_homogeneous, get_num_bits, channel_type, get_pixel_type, pixel_bit_size * image types: indexed_image * color converters: gray -> rgba I would need some help hooking up the tests and doc generation. Let me know if you any questions or improvements. Regards, Christian