Creation of hook file for economics for use with naginata ccap naming co...

Creation of hook file inside ccap-economics.less to allow the naming convention used presently by plone (ccap-booktitle.css)  Inside this hookfile is an import to the newly refactored book.  This structure will go away at some point.  Normalizing this file as other books that have been refactored.  

Tested and no new CSS changes/Diff is caused by replacement.  Derek will regenerate CSS files once subsequent header fix / new CSS generation issue wrapped up.