Added more unit testing to EXTScope to verify that @onExit blocks are run when exceptions are thrown
Added more unit testing to EXTScope to verify that @onExit blocks are run when exceptions are thrown

sunfei/libextobjc,telly/libextobjc,bboyesc/libextobjc,sandyway/libextobjc,liuruxian/libextobjc,kolyuchiy/libextobjc,KBvsMJ/libextobjc,sanojnambiar/libextobjc,WPDreamMelody/libextobjc,goodheart/libextobjc,jiakai-lian/libextobjc