Add a basic menu

Here is code to add a Rinari menu for those who use the menu bar.  I did my best to organize the menu logically but am open to suggestions.

I used easymenu which seems to be included in emacs 23 and 24.  I tested both versions on ubuntu 12.10.

I'm an elisp novice, so feel free to suggest improvements.  It seems like I could drive some of the menu creation from the rinari-jump-schema with a few additions, but I didn't want to dig into that code and muddy it's current purpose.