The unhinged Manhattan college professor who went viral for cursing out anti-abortion students shockingly held a machete to a Post reporter’s neck Tuesday — and made wild threats that she was going to “chop” him up. Shellyne Rodriguez spewed the menacing remarks when The Post knocked on the door of her Bronx apartment Tuesday morning — a day after she made headlines for flipping out on pro-life students at Hunter College. “Get the - away from my door, or I’m gonna chop you up with this machete!” the manic adjunct art professor shouted from behind her closed door just moments...