Recurse until d === 0 instead of d === 2
Recurse until d === 0 instead of d === 2

Because of complex border cases involving ambigous snakes when d === 1,
recurse until d === 0. This is a deviation from myers paper, however
justifiable because we actually are interested not only into the symbols
forming the lcs but also their position in both sequences a and b.


znerol/node-delta,znerol/node-delta,znerol/node-delta