Fix Json int decoder to work with large integers
Fix Json int decoder to work with large integers

rick68/core,rick68/core,Pisys/core,simonh1000/core,simonh1000/core,eeue56/core,bradurani/core,alexiamcdonald/elm-core,ThomasWeiser/core,bradurani/core,Pisys/core,colinmccabe/core,rgrempel/core,ThomasWeiser/core,laszlopandy/core,martinos/core,martinos/core,colinmccabe/core,laszlopandy/core,alexiamcdonald/elm-core,rgrempel/core,eeue56/core