printStdout/printStderr in jake.exec uses console.log which may incorrectly append extra newline characters

Hi!
I recently decided to make a jake task for running jshint and reporting an xml of the results to the stdout using something like ```jake.exec("jshint --reporter=checkstyle rest goes here", {printStdout: true, printStderr: true})``` and doing standard output UNIX redirection with something like ```jake jshint > output.xml```.
When I did this and tried to integrate with other tools I noticed that they were failing to parse the generated file because there were some "mysterious" linefeed characters inserted in the xml file where they should not exist like
```
<node foo="bar" />
<node fo
o="bar" />
```

So I checked jake's code and found out that it is calling ```console.log``` (which appends a newline character) on every ```stream.on('stdout', ...)``` event. I suppose jshint in this case is forcing the flush of data in block units (rather than lines) which causes jake to append newline characters erroneously.

I am appending a patch that simply does process.stdout.write directly. I am still wondering if we should take care of stream.drain events or simply use stream.pipe, but I don't think it is a problem like now. I tried writing a test case but then noticed that I would need to use something like sinon (which would introduce a new dependency) to stub console.log and make sure the data is being written to stdout correctly without extra newline characters.

I would be happy if you could pull this into jake repository.
Thank you in advance.