Adding Justin's reproducible workflow example.

Will start changing this to something more neuroscience-y.
Starting to make changes in the reproducible workflow section.
Small changes to text in the reproducible workflow md file.
Added a notebook with some interactive analysis of data read from files.

Still WIP.
More work on data analysis notebook.
First pass at a tweak of jkitzes' reproducible research tutorial.

Using the same stuff that's in the data analysis notebook. Slightly different
emphasis.
More fixes to the notebook.
Merge branch 'rep_sci' into 2013-05-06-stanford