Fixed missing PDF link, more Pythonic, simplify usage, add Feature Brave

[pastuska]

Servus,

I needed to download some PDFs but it does not find the correct link to the PDF file.

So, I re-wrote it completly:

• fix the not-found PDF link
• made it more PEP8 like
• simplified the usage (one class method, package callable like a script)
• usable with Brave
• some smaller improvements