Rename *.txt to *.rst, PEP-8-ify setup.py
Add a .gitignore
Add a MANIFEST.in
Don't mess with umask and logging in the helper

Logging configuration and global umask settings belong to application
code.  Besides, umask is kind of pointless since GoogleAuth doesn't use
cache and doesn't log passwords in the log file.  It does log login
failures and membership information, so beware.
Document the reusable helper

Bump version number because this is a new feature.
Add Travis build status to the README