mruby-time: remove trailing whitespace
mruby-time: rearrange header order
mruby-time: fix two tiny typos in comments
mruby-time: mrb_time_type should be const
mruby-time: store strings directly instead of pointers to them
mruby-time: timezone_names should be const
mruby-time: store timezone name directly
mruby-time: fix indentation in mrb_time_asctime
Merge pull request #1813 from cremno/time-1

mruby-time: various smaller changes