v6.46.4. Bugfix. Improvement.

- v6.46.4 July 27, 2013
	- Fixes
		- Fixed virtual documents firing duplicated events
			- Plugins should now use `DocPad::cloneModel(model)` instead of
`model.clone()` as the latter can't bind events correctly
		- Fixed `Object #<Model> has no method 'setDefaults'` error (bug
since v6.46.3)
			- Moved `FileModel::setDefaults` back into `Base::setDefaults`
			- Thanks to [Jeff Barczewski](https://github.com/jeffbski) for
[bevry/docpad-documentation#40](https://github.com/bevry/docpad-document
ation/pull/40)
		- Fixed the 500 middleware not working
	- Changes
		- The `documents` collection is now defined by `render:true,
write:true` rather than being paths and `isDocument:true` based
		- The `files` collection is now defined by `render:false, write:true`
rather than being paths and `isFile:true` based
		- The `html` collection now checks for `write:true` instead of
`isDocument:true` or `isFile:true`
		- The `stylesheet` collection now checks for `write:true` instead of
`isDocument:true` or `isFile:true`
	- Additions
		- Added ability to do `getCollection('database')` to get the global
database
		- Added naming to collections to easily identify which collection we
are in when debugging
		- Added `render` alias for documents directory
		- Added `static` alias for files directory
		- Added logging for event emits
		- Re-added `DocPad::parseDocumentDirectory` and `parseFileDirectory`
(removed from v6.46.0) which wraps around the new ways of doing things
		- Added `DocPad::createModel(attrs,opts)` and updated
`DocPad::createDocument` and `DocPad::createFile` to use it
		- Added `DocPad::ensureModel(attrs,opts)` and updated
`DocPad::ensureDocument`, `DocPad::ensurefile`, and
`DocPad::ensureFileOrDocument` to use it
		- Added `DocPad::attachModelEvents(model)` to attach the required
docpad events to a model