improved ipython notebook

This makes some improvements to the initial ipython notebook:

1. Make use of ipython's ability to automatically embed html tables generated from pandas dataframes to display the data in an easier-to-read manner.

2. Make use of panda's plotting capabilities and ipython's ability to embed matplotlib plots to display bar plots similar to (although not as sophisticated as) the plots in the original presentation.

If you want tables that are as pretty as those in the presentation (such as with color-coding), you will probably need to create a custom css stylesheet and load that.  I don't know css so I can't include that.

It should be possible to make the plots prettier when the next matplotlib release comes out by using its theming capabilities.