matplotlib: Fix 'Could not link matplotlib'

Add the following two flags to setup.py
  --record=installed.txt
  --single-version-externally-managed
following the recommendations in the Common-Issues of the Homebrew wiki
under the section "Python: easy-install.pth cannot be linked".

Fixes #43
matplotlib: 1.3.1
matplotlib: python3 support and audit fixes

- Also experimental gtk support.