Added examples for biology

Made a relatable example using some genuine fish data stored in
fish-(8.9|3.9)mgL.dat, typesetting the data in a table and as a plot.
Fixed caption, removed data-file regurgitation

If they want to see the data that went into it, it is simple enough to
read that file within the GitHub repository.
Merge pull request #5 from vermiculus/issue-2

Preliminary examples for biology