Sigh, these sorts of things always force you to change how you develop and don't really work for mobile web dev. This wheel seems to been re-invented far too often.

Alternatively:

  sudo pip install watchdog
  watchmedo shell-command -w -c "make" -i '*/.*' -R

Where "make" is either for a makefile or some other build script.

And then just put live.js (from http://livejs.com/) as a script inside your pages.

This works anywhere with basically any stack (i.e. if you had some strange alien CSS preprocessor as long as it can be processed with a command you can use this), integrates into your normal build system and requires no browser plugins or proprietary binaries.