Proposal to rename menu.py to menus.py

Having difficulties with import menu in menu.py, therefore renamed file to menus.py to avoid collision and plural fits better in Django app folder, where all files are plurals (urls.py, models.py, views.py etc).

Spent 3 hours for debugging (I'm still lame in python) but after renaming to menus.py, tag finally populated context. Also in PyCharm I was warned then I was importing module "menu" in app file "menu.py":

     from menu import MenuItem, Menu

     # Add two items to our main menu
     Menu.add_item("main", MenuItem ....

Don't know how it worked in your case but it didn't in mime :) Will be glad if this will be accepted in upstream as I hate packages from github in my requirements.txt :)