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)
clarify the last change
Merge branch 'master' of https://github.com/bevry/docpad
v6.51.0. Improvement.

- v6.51.0 August 29, 2013
	- Better upgrade `docpad upgrade` and update `docpad update` experience
		- Thanks to [drguildo](https://github.com/drguildo) and [Eduan
Lavaque](https://github.com/Greduan) for [issue
#619](https://github.com/bevry/docpad/issues/619)
	- DocPad will now run the local installation if it exists (avoid this
by using the `--global` flag)
		- Thanks to [Eduan Lavaque](https://github.com/Greduan) and
[flamingm0e](https://github.com/flamingm0e) for [issue
#620](https://github.com/bevry/docpad/issues/620)
	- Added the ability to uninstall plugins via `docpad uninstall
<pluginName>`
	- Updated dependencies
v6.51.1. Bugfix.

- v6.51.1 August 29, 2013
	- Fixed `docpad upgrade`
v6.51.2. Bugfix. Improvement.

- v6.51.2 August 29, 2013
	- Fixed certain pugin tests that require skeleton initialisation
(regression from v6.52.0)
	- When using `--global` flag we won't kill the global instance when
starting a skeleton
v6.51.3. Bugfix.

- v6.51.3 August 29, 2013
	- Fixed `docpad uninstall <pluginName>` (feature introduced in v6.51.0)
v6.51.4. Bugfix.

- v6.51.4 August 29, 2013
	- Fixed `TypeError: Cannot call method 'getLocale' of undefined` when
destroying (regression from v6.49.0)
v6.51.5. Bugfix.

- v6.51.5 August 30, 2013
	- Fixed syntax errors in docpad configuration file not being reported
correctly (regression since v6.49.0)
		- Thanks to [drguildo](https://github.com/drguildo) for [issue
#623](https://github.com/bevry/docpad/issues/623)
	- If a configuration file fails to load we will now tell you which one
it was
v6.51.6. Improvement.

- v6.51.6 August 30, 2013
	- When using writeSource don't write the header if there is no meta
data
	- Added support for `writeSource: "once"`