A teacher booted from one city high school for flirting with students and posting a nearly nude photo of himself on Snapchat is back in the classroom at an elite Manhattan school under a different last name – with the apparent blessing of the city Department of Education, The Post has learned. Gabriel Mitey, 28, who is certified in special education, worked last year at the Lower Manhattan Arts Academy, or LOMA, where several students complained to other faculty of bizarre behavior. Mitey now goes by Gabriel Torres. And despite being the subject of five different probes, he is teaching...