Add debug option to runtests
Add debug option to runtests

Running `runtests` with `debug` will cause mocha to run in debug mode and break on the first line, enabling one to connect a debugger to the running tests and step through a test at their leisure.
RyanCavanaugh/TypeScript,chuckjaz/TypeScript,ziacik/TypeScript,hitesh97/TypeScript,AbubakerB/TypeScript,fabioparra/TypeScript,ionux/TypeScript,DanielRosenwasser/TypeScript,fabioparra/TypeScript,yortus/TypeScript,jwbay/TypeScript,tempbottle/TypeScript,kpreisser/TypeScript,mmoskal/TypeScript,weswigham/TypeScript,basarat/TypeScript,microsoft/TypeScript,RyanCavanaugh/TypeScript,chuckjaz/TypeScript,nojvek/TypeScript,germ13/TypeScript,suto/TypeScript,mmoskal/TypeScript,enginekit/TypeScript,synaptek/TypeScript,moander/TypeScript,Viromo/TypeScript,weswigham/TypeScript,microsoft/TypeScript,impinball/TypeScript,tempbottle/TypeScript,JohnZ622/TypeScript,donaldpipowitch/TypeScript,Eyas/TypeScript,kpreisser/TypeScript,vilic/TypeScript,Eyas/TypeScript,synaptek/TypeScript,hitesh97/TypeScript,enginekit/TypeScript,TukekeSoft/TypeScript,minestarks/TypeScript,MartyIX/TypeScript,plantain-00/TypeScript,gonifade/TypeScript,erikmcc/TypeScript,vilic/TypeScript,synaptek/TypeScript,evgrud/TypeScript,mihailik/TypeScript,DanielRosenwasser/TypeScript,nycdotnet/TypeScript,kimamula/TypeScript,Microsoft/TypeScript,progre/TypeScript,Mqgh2013/TypeScript,samuelhorwitz/typescript,alexeagle/TypeScript,DanielRosenwasser/TypeScript,ziacik/TypeScript,mcanthony/TypeScript,MartyIX/TypeScript,jeremyepling/TypeScript,kimamula/TypeScript,vilic/TypeScript,SaschaNaz/TypeScript,moander/TypeScript,Viromo/TypeScript,basarat/TypeScript,basarat/TypeScript,SimoneGianni/TypeScript,blakeembrey/TypeScript,plantain-00/TypeScript,SimoneGianni/TypeScript,SimoneGianni/TypeScript,impinball/TypeScript,mmoskal/TypeScript,nycdotnet/TypeScript,SmallAiTT/TypeScript,progre/TypeScript,gonifade/TypeScript,weswigham/TypeScript,evgrud/TypeScript,minestarks/TypeScript,DLehenbauer/TypeScript,yortus/TypeScript,germ13/TypeScript,alexeagle/TypeScript,SaschaNaz/TypeScript,shanexu/TypeScript,mihailik/TypeScript,chuckjaz/TypeScript,Viromo/TypeScript,samuelhorwitz/typescript,suto/TypeScript,ionux/TypeScript,evgrud/TypeScript,suto/TypeScript,impinball/TypeScript,rodrigues-daniel/TypeScript,Mqgh2013/TypeScript,kpreisser/TypeScript,erikmcc/TypeScript,kimamula/TypeScript,yortus/TypeScript,tempbottle/TypeScript,MartyIX/TypeScript,mihailik/TypeScript,mmoskal/TypeScript,shanexu/TypeScript,RyanCavanaugh/TypeScript,vilic/TypeScript,JohnZ622/TypeScript,ionux/TypeScript,blakeembrey/TypeScript,TukekeSoft/TypeScript,evgrud/TypeScript,nojvek/TypeScript,SmallAiTT/TypeScript,nagyistoce/TypeScript,plantain-00/TypeScript,germ13/TypeScript,donaldpipowitch/TypeScript,jeremyepling/TypeScript,chuckjaz/TypeScript,minestarks/TypeScript,synaptek/TypeScript,blakeembrey/TypeScript,shanexu/TypeScript,samuelhorwitz/typescript,nojvek/TypeScript,AbubakerB/TypeScript,donaldpipowitch/TypeScript,DanielRosenwasser/TypeScript,mcanthony/TypeScript,nagyistoce/TypeScript,mcanthony/TypeScript,JohnZ622/TypeScript,ionux/TypeScript,nycdotnet/TypeScript,blakeembrey/TypeScript,DLehenbauer/TypeScript,jwbay/TypeScript,TukekeSoft/TypeScript,donaldpipowitch/TypeScript,kimamula/TypeScript,fabioparra/TypeScript,Eyas/TypeScript,JohnZ622/TypeScript,Microsoft/TypeScript,nagyistoce/TypeScript,mcanthony/TypeScript,nojvek/TypeScript,kitsonk/TypeScript,rodrigues-daniel/TypeScript,thr0w/Thr0wScript,thr0w/Thr0wScript,rodrigues-daniel/TypeScript,kitsonk/TypeScript,MartyIX/TypeScript,plantain-00/TypeScript,erikmcc/TypeScript,thr0w/Thr0wScript,Viromo/TypeScript,hitesh97/TypeScript,samuelhorwitz/typescript,erikmcc/TypeScript,yortus/TypeScript,moander/TypeScript,DLehenbauer/TypeScript,basarat/TypeScript,fabioparra/TypeScript,jeremyepling/TypeScript,enginekit/TypeScript,Mqgh2013/TypeScript,nycdotnet/TypeScript,rodrigues-daniel/TypeScript,mihailik/TypeScript,Eyas/TypeScript,DLehenbauer/TypeScript,SaschaNaz/TypeScript,alexeagle/TypeScript,kitsonk/TypeScript,gonifade/TypeScript,AbubakerB/TypeScript,jwbay/TypeScript,jwbay/TypeScript,SmallAiTT/TypeScript,progre/TypeScript,Microsoft/TypeScript,thr0w/Thr0wScript,ziacik/TypeScript,ziacik/TypeScript,SaschaNaz/TypeScript,AbubakerB/TypeScript,moander/TypeScript,microsoft/TypeScript,shanexu/TypeScript