Script Summary: Enhances http://stackoverflow.com, http://meta.stackoverflow.com, http://superuser.com, and http://serverfault.com.
* Adds sister-site navigation links to the header menus.
* Adds a "revisions" link to each question and answer.
* Highlights the voting controls of community wiki posts, (ie, no reputation).
* Adds "N" access key to Next buttons.
* Blocks ads (disabled by default).
Version 1.3.0.1 is Firefox 17 compatible
