Define ARY_MAX_SIZE strictly. Use mrb_int instead of int.
Clean up range.c. Use mrb_int. Use mrb_vtype.
Merge pull request #936 from monaka/pr-cleanup-range.c-20130303

Clean up range.c. Use mrb_int. Use mrb_vtype.
Merge pull request #934 from monaka/pr-use-mrb_int-in-array.c

Define ARY_MAX_SIZE strictly. Use mrb_int instead of int.
fix mrb_int for INT64 env