Rearrange Windows setup instructions to be more intuitive

The current order risked students running the SWC installer
before installing either Python or GitBash (one of which is a
dependency depending on the installer).

The instructions also risked it sounding like it would install
everything instead of just adding a few extra pieces.
Merge pull request #1 from ethanwhite/gh-pages

Rearrange Windows setup instructions to be more intuitive
Fixing days of the week
Merge branch 'gh-pages' of github.com:swcarpentry/2014-04-02-uvic into gh-pages