Despite this country's reputation for tolerance, young people still face discrimination for being gay, writes ALANNA MITCHELL. When school life becomes so hostile they can't face it any more, Toronto's Triangle program offers an educational refuge The classroom is makeshift, constructed by members of the congregation of this Toronto church in a building bee one weekend. And it's cramped. About a dozen high-school students, ranging across all grades, bundle their legs underneath tables that have been pushed together in two facing rows. A bookshelf beside them holds the Concise Oxford Dictionary, Webster's New World Thesaurus and The Encyclopedia of Gay...