You’ve got to be a grade A sleaze bag to steal from kids’ public schools.   But that’s exactly what a growing number of slime balls are doing when they hack into schools’ computer networks and hold their data for ransom.   Even worse – districts are paying it!   Just this week the Rockville Center School District in New York state paid an $88,000 ransom to get back files that had been encrypted by Ryuk ransomware.   The district…