Describe the data in the Index entity

See #264

git-svn-id: http://gsoc.svn.wordpress.org/2013/rmccue/trunk@1981 f69abe3c-2ee2-4550-9a6d-17bd458115be
Describe the data in the Post entity

See #264

git-svn-id: http://gsoc.svn.wordpress.org/2013/rmccue/trunk@1982 f69abe3c-2ee2-4550-9a6d-17bd458115be