Update version number to v6.44.0
Relative path conflict detection now supports virtual documents
Fixed cannot get detectEncoding from undefined
v6.44.0. Improvement.

- v6.44.0 July 2, 2013
	- Model Improvements
		- Way better support for virtual documents (files that do not have a
physical path)
		- Cleaned up and fortified the normalization and contextualize
prodecures
		- At least one of these file attributes must be specified:
`filename`, `relativePath`, `fullPath`
			- `relativePath` if not set will default to `fullPath` or `filename`
			- `filename` if not set will default to the filename of `fullPath`
or `relativePath`
			- `fullPath` will not default to anything, as it is now optional
(providing better support for virtual documents)
		- The following file attributes are auto set but can be over-ridden
by custom meta data: `date`, `name`, `slug`, `url`, `contentType`,
`outContentType`, `outFilename`, `outExtension`, `outPath`
		- The following file attributes are forcefully auto set:
`extensions`, `extension`, `basename`, `outBasename`,
`relativeOutPath`, `relativeDirPath`, `relativeOutDirPath`,
`relativeBase`, `relativeOutBase`, `outDirPath`
		- Added these new file attributes: `outBasename`, `relativeOutBase`,
`fullDirPath`
		- Updated a lot of log messages to support virtual documents
		- `buffer` is now correctly set as a File option
		- `File::setMeta(attrs)` can now accept meta backbone models instead
of just javascript objects
		- File and Document methods now use
[extract-opts](https://github.com/bevry/extract-opts) for their
arguments just like DocPad already does
		- Removed the incorrect dangling file attributes: `path` and `dirPath`
		- Added new `FileModel::clone` method for making a clone of the file,
attributes, opts, events and all will be cloned
	- Core Improvements
		- Added `getFileById(id, opts={})` template helper and docpad class
method
		- Plugins can now alter the load, contextualize, render, and write
collections
		- Added a new `lib/util` file for containing misc functions
		- Added `DocPad::destroy()` method for shutting down the server and
whatnot
			- Currently only shutdowns the server, we still need to add the rest
of the things
	- Testing Improvements
		- RendererTester is now more helpful when comparing differences
between outputs
		- DocPad tests now use the new docpad destroy method that allows
graceful shutdown rather than the previous ungraceful `process.exit(0)`
			- Still needs to be applied to plugin tests