Reformatted the code a little bit

Made it easier and more comfortable to read (Personal preference).
Fixed dark blue skins

Made the script convert non true color images to true color.
Made char (Steve skin) the fallback image

If players don't have a skin they will now get the default skin (just
like in game).
Fixed weird results because of 1.8 skins

Cropped 1.8 skins back to the old skin format so that they will still
work.
Uncomment some commented code
Updated the readme file