Updated jsbeautifier/beautify.js to latest version

I had some issues with string parameters being prepended by a newline (inside the string) in certain files.

For example the following method:
```
test.ok(1 == testValue, 'The test failed');
```
Would be converted to the following:
```
test.ok(1 == testValue, '
The test failed');
```
Obviously resulting in broken code...

I'm unsure what caused the issue, as it only occurred in certain files and even then only in specific parts of the files, even though they contained unit tests with a large amount of semantically, but not syntactically, different code. Your guess is a s good as mine what was the cause, but updating to the latest version of [js-beautify](https://github.com/einars/js-beautify) seems to resolve the problem without damage to the existing project.
Seeing how you've included the library about 9 months ago, I figured an update was due and you'd probably be interested in a tested patch ;)