v2.3.0. Improvement.

- v2.3.0 December 12, 2013
	- Added support for `cssmin` plugin
		- Thanks to [Rob Loach](https://github.com/RobLoach) for [pull
request #6](https://github.com/docpad/docpad-plugin-less/pull/6)
	- Repackaged
	- Dependency upgrades
		-  `less` from ~1.4.2 to ~1.5.1