Uploading 2.1.0.

git-svn-id: https://plugins.svn.wordpress.org/amazon-auto-links/trunk@1033494 b8457f37-d9ea-0310-8a92-e5e31aec5664
Marked 2.1.0 as stable.

git-svn-id: https://plugins.svn.wordpress.org/amazon-auto-links/trunk@1033496 b8457f37-d9ea-0310-8a92-e5e31aec5664