Fix indent in string.c
Fix typo
return value from mrb_gc_arena_save() is int
restore arena after mrb_define_method()
Merge branch 'master' of github.com:mruby/mruby
Merge pull request #978 from carsonmcdonald/timetypofix

Fix typo
Merge pull request #976 from kano4/dev

Fix indent in string.c