Update hook to remove extra biblio contributors

#2128 
@rbran100 can you review this?  In the HWPI database there are 18 biblio contributors, there should only be 2, Author and Editor.  

This update hook will:
 * Check to make sure there are more than 2 contributors
 * Rename contributor 2 to Editor so it matches up from scholars/projects for importing purposes.  
 * Sanity to check to make sure no one used any of those extra biblio contributors, if they did, set them to Editors. 
 * Delete the extra contributors.