Merge pull request #24 from aspiers/master

gracefully handle non-parseable dates (fixes #23)
maildir-deduplicate.py was emancipated to its own repository. It is now hosted at https://github.com/kdeldycke/maildir-deduplicate
Update content list
Highlight the case of maildir-deduplicate.py
Add loads of contextual details.
Update introduction
Add my Kubuntu bootstrap script.
Add install script for OSX
Add virtualenv
Force Homebrew binaries to take precedence on OSX defaults
Distribution install files moved to a dedicated repository.