Fix COOK-4663

validate_month fails on Fixnums. check spec.class before validating.
COOK-4664

validate_dow fails on Fixnums. Check spec.class before validating
Merge pull request #31 from jordane/fix_validate_month_Fixnum

COOK-4663
Merge pull request #32 from jordane/fix_validate_dow_Fixnum

COOK-4664
updating CHANGLOG and bumping metadata
RE: #44, fix the case statement
Merged catch_up_upstream into master