Core Fixes:
* Error in base greeting that referenced tweets vs posts/content
* Fix author select box so that it selects previously-selected author
* Only load Author, Editor and Administrators in the author box. Hopefully avoid memory problems on sites with lots of Subscribers etc
* Use display_name for authors


git-svn-id: https://plugins.svn.wordpress.org/keyring-social-importers/trunk@913527 b8457f37-d9ea-0310-8a92-e5e31aec5664