LIBWEB 1744. Research Pentaho XML transformations for univ_arch website

First prototype transformation. This creates a wxr xml that can be used to import into the wordpress
website.

Problems to tackle-
1. Fix html tags that show up in the posts.
2. Get image mappings.
3. Map categories so that posts are not uncategorized.
4. Map comments and authors properly.

(https://issues.umd.edu/browse/LIBWEB-1744)