Bump stable tag to version 0.6.


git-svn-id: https://plugins.svn.wordpress.org/tagregator/trunk@1023258 b8457f37-d9ea-0310-8a92-e5e31aec5664
Clarify that screenshots are just with default CSS.

The user can use custom CSS on their site to change how it looks.


git-svn-id: https://plugins.svn.wordpress.org/tagregator/trunk@1023261 b8457f37-d9ea-0310-8a92-e5e31aec5664