devel/py-tailer: Add py-tailer 0.4.1

Python tail is a simple implementation of GNU tail and head.

It provides 3 main functions that can be performed on any file-like object that
supports seek() and tell().
- tail: read lines from the end of a file
- head: read lines from the top of a file
- follow: read lines as a file grows

WWW: https://github.com/six8/pytailer