Add version guard for Time.{gm|utc} with a special year
Add version guard for Time.{local|mktime} with a special year
Merge pull request #8 from kachick/fix-time-cunstructors_with_special_year

Add version guard for Time.{gm|utc|mktime|local} with a special year

Since 1.9.1, 0..38 is 0..38 not 2000..2038.