Document -rgb option in djpeg man page;  "gray-scale"="grayscale"


git-svn-id: svn://svn.code.sf.net/p/libjpeg-turbo/code/trunk@1294 632fc199-4ca6-4c93-a231-07263d6284db
Add support for decompressing to RGB565 (16-bit) pixels


git-svn-id: svn://svn.code.sf.net/p/libjpeg-turbo/code/trunk@1295 632fc199-4ca6-4c93-a231-07263d6284db