updated README sample custom indexer to take advantage of improvements in r6792 and r6689
updated README sample custom indexer to take advantage of improvements in r6792 and r6689


git-svn-id: 5d6b6036baf4730b38412b97b324c1153d0acf91@6799 ee427ae8-e902-0410-961c-c3ed070cd9f9

rande/sfSolrPlugin,rande/sfSolrPlugin