Staten Island's Ninja Burglar struck again late last week, slipping furtively and unseen into a doctor's home on Melbourn Rd. in the Castleton Corners section of the borough. No one was home at the time and he scored big in his 19th break-in since May of last year, making off with $20,000 in jewelry. The theft comes just a little over a month after the man in black struck twice in quick succession in......