Remove local README file, using Index notebook now.
Lots of updates and cleanups for pycon 2014 tutorial.
Add a proper readme to repo
Move starcluster config file to parallel section.x
Add solution to bash exercise
Add screenshots about modal UI
Add top-level Index to organize presentation
Add intro to interactive widgets.
Add coffee image from scikits image as plain numpy array.

This will let us illustrate with only basic numpy (and at most
matplotlib for visualization).
Remove numbers from file names, we're using Index.ipynb now.