Possible bugs with fixes, improvements

[aplavin]

Not sure if you are going to continue the development, but recently I came across some fixes and improvements I made long ago - in 2011. The parts of code I modified back then look almost the same now, so the changes may still be applicable. I myself don't write in C# anymore and don't have the software installed, so I can't test it myself now.

The repository with my changes is at https://github.com/aplavin/nreadability (see last 3 commits).