WordPress import category search list

This includes the one from #99 (34d2b78), but after you accept it, it should just show one commit (45fe553).

This is the commit you said you probably didn't want, but I tried to do it the best I could (I'm a .Net developer by trade). Let me know if you think it's worth importing. It works really, really well and it's not very complicated. The categories are pulled in with the same database query as the tags.

Commit notes: Added desired category search list for wordpress database imports. Allows passing categories in order of preference for matching and adding to each post page.