v6.27.0. Improvement.

- v6.27.0 March 25, 2013
	- Engine requirements are now:
		- node >=0.8
		- npm >=1.2
	- Iconv is now a lazy loaded dependency
		- Thanks to [jhuntdog](https://github.com/jhuntdog) for [issue
#468](https://github.com/bevry/docpad/issues/468)
	- Added `regenerateDelay` configuration option
		- Thanks to [Homme Zwaagstra](https://github.com/homme) for [pull
request #426](https://github.com/bevry/docpad/pull/426)