Update .gitignore: ignore .DS_Store, xcuserdata
Update .gitignore: ignore .DS_Store, xcuserdata

shabbirh/CHCSVParser,TimurD/CHCSVParser,mjasa/CHCSVParser,xmkevinchen/CHCSVParser,shabbirh/CHCSVParser,PhilJay/CHCSVParser,mjasa/CHCSVParser,TimurD/CHCSVParser