I spent the last hour or so remaking and testing the skin template that Mojang released in the 14w03a/b snapshot.
I have put colours in so you know which face is which.
Here is the guide:
Green = Front
Yellow = Left
Light Blue = Right
Magenta = Top
Indigo = Bottom
Red = Back
Please also note that the lines on the sides of the top and bottom of the head tell you which side connects to which.
[EDIT] I should also add that the legs and arms are based on the actual character's point of view. This means that what is marked as the left leg is the left leg for the character that you are making etc.
Here is the picture:
Just right click and save the picture.
I used a program called Seashore to edit it, as there is no current 1.8 skin editor. You could also use a program such as Photoshop or Paint.