Six months after a 15-year-old boy was slain by thugs over a $200 iPod, a second alleged Crip gang member is charged with his murder — as the boy's devoted parents vow to help keep a Brooklyn neighborhood safe from gangs. "People are afraid, but they're starting to come forward. I'm thankful there's been a break in the case," said father Errol Rose, 53. On July 2, Christopher Rose was on his way to a Fourth of July pool party in Pennsylvania. He was listening to a friend's iPod while walking two blocks away from his mother's home in East...