Added config options: affect.food.hunger.values and affect.negative.food.values
 * affect.food.hunger.values defaulted to true
 * affect.negative.food.values defaulted to false
 * affect.negative.food.values can be set to false and affect.food.saturation.modifiers can be set to true to make diminishing returns affect saturation only
 * Closes #20
Merge branch 'master' of https://github.com/squeek502/SpiceOfLife into 1.7.x