Revert "Ignore nodejitsu"

Website is back up. We'll still want to remove deploy + docs by end of
the month. @BanzaiMan

http://blog.nodejitsu.com/all-nodejitsu-services-extended-to-december/

This reverts commit f982193.

Author: plaindocs

Rakefile

@@ -36,7 +36,6 @@ task :run_html_proofer do
                               :only_4xx => true,
                               :typhoeus => { :ssl_verifypeer => false, :ssl_verifyhost => 0, :followlocation => true },
                               :url_ignore => ["https://www.appfog.com/",
-                                              /nodejitsu.com/,
                                               /coverity.com/],
                               :file_ignore => ["./_site/api/index.html", "./_site/user/languages/erlang/index.html"]
                             })