add urlize to my list of extensions for Markdown preview (when I use "Markdown Preview: Python Markdown: Preview in Browser")
curl https://raw.github.com/r0wb0t/markdown-urlize/master/urlize.py -o ~/Desktop/urlize.py
mv ~/Desktop/urlize.py ~/Library/Application\ Support/Sublime\ Text\ 2/Packages/Markdown\ Preview/markdown/extensions/urlize.py
cd ~/Library/Application\ Support/Sublime\ Text\ 2/Packages/Markdown\ Preview/markdown/extensions
sudo python2.6 -m compileall .