* www/project_links.html:  add links to two more Subversion books.
* www/project_links.html:  add links to two more Subversion books.

jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion