Add bracketing tests to show issue with leap years and ranges
Add extra failing tests to cover Month behaviour with leap years
Correct Date zero-indexed months typo
Fix leap-year range iteration bug for string shorthand DateRange#by invocation
Merge branch 'leap_year_tests'

* leap_year_tests:
  Correct Date zero-indexed months typo
  Add extra failing tests to cover Month behaviour with leap years
  Add bracketing tests to show issue with leap years and ranges
Merge branch 'leap_year_fix'

* leap_year_fix:
  Fix leap-year range iteration bug for string shorthand DateRange#by invocation

Conflicts:
	lib/moment-range.js
Version bump to 0.1.4