add date/isLeapYear. see #28
add date/totalDaysInMonth. see #28
Normalize array iteration methods and null array handling
Update changelog
update CHANGELOG to include isLeapYear and totalDaysInMonth
Use `len` for length var in array iteration
Add tests for undefined arrays
Merge pull request #73 from conradz/array-iteration

Normalize array iteration methods and null array handling
Update changelog, see #56 #59
add info about Gregorian calendar to leap years
Merge pull request #72 from millermedeiros/date-leap

Date isLeapYear + totalDaysInMonth
improve build script to update changelog automatically
bump version to 0.5.0
add date package to gitignore