RF: fix up some formatting

Adding good/bad feedback.

Actually commit the git tutorial files.

in, not if.

iReplaced old ipynb

Updated README.rst with information about the Makefile and shell scripts

Some of the good and bad feedback we've collected so far.

Merge branch 'master' of github.com:swcarpentry/2012-11-UNC

added instructors to page

Minor tweaks to download material