Added a functions.php file to hold all commonly used functions (i.e. hooks, sorting, etc...) Added a delete_user hook so that when an admin deletes a user from the database through the Users admin page, the hook deletes the user from any gradebook table that they are associated with.

git-svn-id: https://plugins.svn.wordpress.org/an-gradebook/trunk@905960 b8457f37-d9ea-0310-8a92-e5e31aec5664