982f31e75c
Mainly javadoc changes to be specific in functionality and outcomes. This is mixed with specifying that null Material should throw IllegalArgumentException instead of the previous undefined NullPointerException. Included is a clarification on how contains(ItemStack, int) works, and a new method containsAtLeast(ItemStack, int) for counting the number of a specific item. By: Wesley Wolfe <weswolf@aol.com>