moment/moment — pull request #1396 by mdxs (2014-01-06 13:41:34+00:00)
Title: Added leftZeroFill to GGGG and gggg formats

Added leftZeroFill to GGGG and gggg formats (similar to how YYYY and other year formats do). Expanded testing for these cases; and in the process added testing for W and fixed a typo in some existing tests.