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
Fix problem with iframe and HTTP and HTTPS

In a page loaded with HTTPS is insecure to load a iframe with
HTTP and most of the browsers will block it. [1]

To avoid this problem we could let the browser use the currently
protocol. [2]

[1] https://support.mozilla.org/en-US/questions/958305#answer-476475
[2] http://stackoverflow.com/q/9161769/1802726
Remote link to nonexistant lesson
Merge pull request #483 from r-gaia-cs/https

Fix problem with iframe and HTTP and HTTPS
Merge pull request #480 from ethanwhite/installer

New, self-contained, Windows installer
Merge pull request #484 from gdevenyi/fix404

Remove link to nonexistant lesson