Remove commented out (latex) lines and code formatting

Hi,
nice tool! I added some basic functionallity to automatically remove commented out lines, that are commented out using '%' e.g.
```latex
First great line that will be kept

% This is the commented out line that will be removed

Second great line that will be kept
```

I stumbled upon this when trying the abstract from my master's thesis.

I also fixed some formatting stuff along the way. fixjsstyle is actually pretty cool, used for the first time today.