Update Politeness V2 based on revised package

[xehu]

We need to update politeness_v2 and politeness_v2_helper with the revised package code.

I spoke with the developer of the software at a conference, and it seems that they've released revised code --- it outputs the same number of features as before, but the way that they calculate the features is now different. Let's align our code with the updated version to ensure that things now match.

Link to revised package: https://github.com/bbevis/politenessPy