Update the schema to match latest changes

See #264

git-svn-id: http://gsoc.svn.wordpress.org/2013/rmccue/trunk@2355 f69abe3c-2ee2-4550-9a6d-17bd458115be
Ensure empty attachment meta is an empty object

git-svn-id: http://gsoc.svn.wordpress.org/2013/rmccue/trunk@2356 f69abe3c-2ee2-4550-9a6d-17bd458115be
Add documentation on the Media schema

Fixes #264

git-svn-id: http://gsoc.svn.wordpress.org/2013/rmccue/trunk@2357 f69abe3c-2ee2-4550-9a6d-17bd458115be
Bump to 0.6

git-svn-id: http://gsoc.svn.wordpress.org/2013/rmccue/trunk@2358 f69abe3c-2ee2-4550-9a6d-17bd458115be