Make separate directory for Windows installer
Add setup.py file for building Windows installer

This setup.py file allows building an executable version of the
installer that doesn't require an external Python installation.
Add script for building Windows installer

This script tells Inno Setup how to build the stand alone installer
Add a Software Carpentry icon file for Windows installer
Add indication that the Windows installer is running

The Windows installer opens a shell while running. This adds some
text to that shell so that it is clear that something is happening.
Renaming Windows installer directory
Merge pull request #480 from ethanwhite/installer

New, self-contained, Windows installer