Hans Megie, 33, was charged last night with sexually assaulting his three foster children and trying to kill two of them.  He raped a 10 year old girl twice, and sodomized her 8 year old brother and 6 year old sister last spring.  He allegedly taped the two younger children’s mouths shut, put plastic bags over their heads and chained them in a closet in an attempt to kill them, according to police.  The children were returned to their biological mother in September and told her of the attacks, which