new resource elements of morphology

a new resource is the Elements of Morphology from NHGRI:
http://elementsofmorphology.nih.gov/index.cgi

ideally, we want to scrape every term like this:
http://elementsofmorphology.nih.gov/index.cgi?tid=5dec14811ba250f8

in this example, Ablepharon should have the id 5dec14811ba250f8, perhaps assigned the prefix EOM. then we need to scrape the different parts of the page. be sure to collect any links to images as well.

be sure to get all the categories that are listed in the menubar on the left.