Content size includes an extra amount of padding

[adamlwgriffiths]

Content size is currently calculated like this (for vertical alignment).

float width = 0.0;
float height = 0.0;

// calculate contentSize,
CCMenuItem *item = nil;
CCARRAY_FOREACH(children_, item)
{
    height += item.contentSize.height * item.scaleY + padding;
    width = MAX(item.contentSize.width * item.scaleX, width);
}

This includes 1 padding per item.
But the last padding should always be removed.
A better method is as follows:

float width = 0.0;
float height = 0.0;

// remove 1 amount of padding
int itemCount = [children_ count];
if ( itemCount > 0 )
{
    height -= padding;
}

// calculate contentSize,
CCMenuItem *item = nil;
CCARRAY_FOREACH(children_, item)
{
    height += item.contentSize.height * item.scaleY + padding;
    width = MAX(item.contentSize.width * item.scaleX, width);
}