v6.50.1. Bugfix.

- v6.50.1 August 28, 2013
	- Fixed validation of DocPad sites containing the powered by header
		- Thanks to [drguildo](https://github.com/drguildo) and [Eduan
Lavaque](https://github.com/Greduan) for [issue
#618](https://github.com/bevry/docpad/issues/618)