v6.28.0. Improvement.

- v6.28.0 March 25, 2013
	- Removed native prototype extensions
		- Thanks to [David Baird](https://github.com/dhbaird) for [issue
#441](https://github.com/bevry/docpad/issues/441)
		- If you were using `toShortDateString`, then we'd recommend [this
gist](https://gist.github.com/4166882) instead
		- If you were using `toISODateString`, just replace it with
`toISOString`