Merge pull request #187 from andreww/2013-09-bristol

Installation fixes for 2013-09-bristol bootcamp
Merge pull request #188 from andreww/2013-09-bristol

Update README.md
Added presentation on version control

I'll use this alongside some live coding so folks can follow along either in shell or in Git Bash.
Removed old ppt (not using it)
Added some more notes to version control's README
Updated the python lesson plan to match the layout of the day and to make space
for the numpy lesson
I've added in a lesson on NumPy, together with an exercise to create a NumPy
nose-test for the Matrix class
Fixing the links at the bottom of the pages
Forgot to update the link on the README page!
Updated the conclusion powerpoint presentation to fit in with the ideas
we will be presenting at the Bristol boot camp
Work around for python '.rcX' in installation test