Small API fix and and addition to the plugin loader to load only plugins that conform to the "NAME" convention.

Also please excuse the "repost" of the system info plugin, but I've done it on my refactor branch being sure that it will get in.. and you have redone the plugin already. And to answer your question from a second ago -- maybe you've missed the pull request for like a day and did the plugin yourself after I have already submitted it :).
I killed the PR since it is now irrelevant.
Ok, I'll add your change. Can't hurt.