String-path-search

Further refinements to packaging and documentation.

This release boasts simplified syntax and removes the 260 path limitation from the standalone .exe on Windows.

Tweaks to the program usage and README. This will be the first version published on pypi.

This version has better invocation semantics (python -m string_path_search [OPTIONS]) and better documentation. It will be the first version available on pypi. Starting with this release, I've discontinued providing a windows .exe. This is because I was unable to workaround the 260 char path length limitation with using pyInstaller and its ilk.

It turns out that pyinstaller inherits the old W32 260 character limit on file paths. This was causing scanner.exe to crash when it hit a long path. This version does not fix the problem, but at least it doesn't crash. Instead, it logs the error, and moves on. The problem only affects the binary release. 'python3 scanner.py' scans long paths without issue.