script to import xml files

many assumptions until we get more xml files:
- assumes all xml files are in one directory (as opposed to having all
items in one xml file)
- assumes first <p> tag in itembody is the stem (seems that way from
the single test item given) and any following <p> tags are part of
source, and any <img> tags found are appended to media
- assumes the "text&image" answer types will be in the format of an
<img> tag followed by text without any tags around it (becuase in the
one item type provided that is jus text anstype, the text is not inside
any tags

- doesnt import items yet, still needs to go through and download the
media, place it in folders on the server, and generate insert
statements to add to db_setup file