extra Help menu entries for only staff/moderators (community management links)

Adds links to the bottom of the Help menu for various documents used by staff and moderators. This links are visible to only players who have the "admin" flag set. Requested by Breadstrings in https://plus.google.com/114447825469587375506/posts/eFSCmDTsLxr

![screen shot 2014-10-03 at 8 24 57 am](https://cloud.githubusercontent.com/assets/1495809/4499464/111c99da-4a83-11e4-92ab-99386d0e6d26.png)

@lemoness : Is this okay?
All that people can tell from these links is that we have a Contributor Guild (which they could already find out about from the wiki), and that we keep spreadsheets to track issues and to give socialite rewards (both good things for us to do; I can't imagine anyone complaining about us doing that). They can read the template document, but that's just material we'd post into the Tavern anyway (and we could protect the template document in the same way the spreadsheets are protected).

However, no, they're not necessary. I only did it because Mel B asked for it in the Contributor Guild and no one complained about the idea. I'll close the PR now.