Added XTL example of dealing with Boost variant
Added XTL example of dealing with Boost variant

mafiya69/Mach7,tushar2708/Mach7,tushar2708/Mach7,vscharf/Mach7,tushar2708/Mach7,vscharf/Mach7,akrzemi1/Mach7,mafiya69/Mach7,vscharf/Mach7,akrzemi1/Mach7,mafiya69/Mach7,akrzemi1/Mach7,akrzemi1/Mach7,tushar2708/Mach7,vscharf/Mach7,mafiya69/Mach7