Fix Node 0.10 and 0.12 ESlint
Fix Node 0.10 and 0.12 ESlint

TinOo512/bookshelf,rbong/bookshelf,bookshelf/bookshelf,rbong/bookshelf,bookshelf/bookshelf,seegno-forks/bookshelf,tgriesser/bookshelf,TinOo512/bookshelf,seegno-forks/bookshelf,tgriesser/bookshelf