Enable support for sharing to Reddit and Stumbleupon when using the Genericons display type (and add those icons to the text display type), now that Genericons includes those icons. These share types are still off by default.

git-svn-id: https://plugins.svn.wordpress.org/quickshare/trunk@809188 b8457f37-d9ea-0310-8a92-e5e31aec5664