v2.3.0. Improvement.

- v2.3.0 January 19, 2013
	- Updated [jade](https://github.com/visionmedia/jade) dependency from
0.27 to ~0.28.1
		- Closes [pull request
#4](https://github.com/docpad/docpad-plugin-jade/pull/4) thanks to
[Evan Bovie](https://github.com/phaseOne)