Merge from vendor branch TNF:

Merge from vendor branch TNF:
Importing devel/ruby-thor 0.14.0.

Thor is a simple and efficient tool for building self-documenting
command line utilities.  It removes the pain of parsing command line
options, writing "USAGE:" banners, and can also be used as an
alternative to the [Rake](http://github.com/jimweirich/rake) build
tool.  The syntax is Rake-like, so it should be familiar to most Rake
users.