mxcl/homebrew — pull request #14390 by samueljohn (2012-08-22 19:43:32+00:00)
Title: doctor: Look for symptoms of python.org's installer

People try the Python.org's installer before they see the beauty of Homebrew. When they then try to `brew install python`, it fails.

The reason is that the python.org installer throws a lot of symlinks into `/usr/local/bin` and adds it's path upfront to PATH. As if this is not enough, it installs as "root".

Therefore, I'd like these extra checks to be in doctor.rb.

Please review.