Binary safe copyFile for muffin.js

gistfile1.coffee

# Use Piping Streams to copy files
copyFile = (source, target) ->
	deffered = Q.defer()

	muffin.mkdir_p path.dirname(target), 0o755, (err) ->
		return done(err) if err
		# Start Read Stream
		rd = fs.createReadStream source
		rd.on 'error', (err) ->
			done err
		# Start Write Stream
		wr = fs.createWriteStream target
		wr.on 'error', (err) ->
			done err
		# Handle end of write
		wr.on 'close', (ex) ->
			done()
		# BEAM ME UP SCOTTY!
		rd.pipe wr

	done = (err) ->
		if err
			muffin.notify source, 'Failed copy operation', true
			return deffered.reject(err)
		deffered.resolve()

	deffered.promise