v6.52.0. Bugfix. Improvement.

- v6.52.0 September 8, 2013
	- Pay more attention to getmac errors
	- Ensure completion callback (when specified) is always fired for the
`DocPad::error` and `DocPad::track` methods
	- Fixed `DocPad::getBlocks` returning the DocPad instance instead of
the blocks
		- Thanks to [Bruno Heridet](https://github.com/Delapouite) for [pull
request #612](https://github.com/bevry/docpad/pull/612)
	- Added `DocPad::getIgnoreOpts` method to help clean up some code
		- Thanks to [Bruno Heridet](https://github.com/Delapouite) for [pull
request #612](https://github.com/bevry/docpad/pull/611)
	- Removed all calls to `process.exit` by instead destroying DocPad
properly causing an automatic shutdown if that is what is desired
	- Fatal errors are now written to stderr instead of stdout
	- Updated dependencies