Update 2013-02-05-Part-1-Setup-raw-data.md

Was an infinite loop. Updated to match source
Update 2013-02-02-Part-4-Logic-of-the-script.md

Also need to import os
Update 2013-02-03-Part-3-JSON-Parsing.md

dpi is not a valid argument to plt.show(). changed incorrect adjusted_price variable to adapted_price