[ISI WoK] Rewrite web translator. Fix multiples.

This should take care of issues with multiples.

It needs to be tested some more. I'm not very familiar with ISI WoK, so I'm not sure if I'm testing it everywhere.

If it works, this addresses reports at http://forums.zotero.org/discussion/23825/ http://forums.zotero.org/discussion/1966/ http://forums.zotero.org/discussion/24890/ http://forums.zotero.org/discussion/18921/ (I think) 

It also apparently makes it possible to save from marked lists (though I didn't even intend for this to be fixed) http://forums.zotero.org/discussion/19836/

And it can be removed from http://www.zotero.org/support/known_translator_issues