fix: ignore comments in .pth files

[GabDug]

Fixes #84

Had the same issue with pdbpp on OS X, this made the trick.

This is a very naive implementation for single-line comments, feedback welcome.

[pawamoy]

Thanks for the PR!

So indeed the initial implementation was very naive. I've looked it up and found these docs:

A path configuration file is a file whose name has the form name.pth and exists in one of the four directories mentioned above; its contents are additional items (one per line) to be added to sys.path. Non-existing items are never added to sys.path, and no check is made that the item refers to a directory rather than a file. No item is added to sys.path more than once. Blank lines and lines beginning with # are skipped. Lines starting with import (followed by space or tab) are executed.

I'll suggest some code modifications a bit later, unless you want to tackle it and follow the spec (not hard anyway).

[pawamoy]

Merged! Thanks again! Will release a new version.