There are a number of small backwards incompatible changes with version 2.0.0. [See the full descriptions here](https://gist.github.com/timrwood/e72f2eef320ed9e37c51#backwards-incompatible-changes)
* Changed language ordinal method to return the number + ordinal instead of just the ordinal.
* Changed two digit year parsing cutoff to match strptime.
* Removed `moment#sod` and `moment#eod` in favor of `moment#startOf` and `moment#endOf`.
* Removed `moment.humanizeDuration()` in favor of `moment.duration().humanize()`.
* Removed the lang data objects from the top level namespace.
* Duplicate `Date` passed to `moment()` instead of referencing it.