add link to article quoting Asimov (resolves #44)

The two EDA/visualization days likely need to be rebalanced.
This article is probably a better introduction than the messy
Tufte article. Focus: EDA and data viz are tightly linked,
and important.
Merge pull request #89 from ajschumacher/eda_funny

add link to article quoting Asimov (resolves #44)