[Developers] Changes to /education/education

[Bryan Cheung]

There are some changes that refactors dissertations out from the  
education type.  For details, see these links:

http://www.freebase.com/discuss/threads/guid/9202a8c04000641f8000000009cf3021
https://bugs.freebase.com/browse/DA-514

I've made the changes to sandbox - if there's anyone that will be  
adversely affected by this change, speak up; otherwise, I plan to make  
this change to production next week.

Bryan