Version 1.3.1

Added <figure> to known image container tags. However, many RSS readers don't appear to support inline styles for this tag, so it's anyone's guess how well that'll work in practice.

Also, it appears that some readers that previously supported arbitrary image alignment (e.g. Opera Mail) no longer do.

git-svn-id: https://plugins.svn.wordpress.org/align-rss-images/trunk@1047929 b8457f37-d9ea-0310-8a92-e5e31aec5664