permissions.php

[jkeesh]

I think we should create a file permissions.php which is included in all of the views
student, assignment, code, (and section leader aka main)

Here is the function it should have:
hasPermissionsForSection(class, sl)
hasPermissionForClass(class)
hasPermission(class,student)
// if USERNAME has permission to see 'student' in 'class'

this will check against some set constant or array to see if they have permission
if user is a student, he can see his own info
if user is a sl, he can see it if he is a sl for that class
if user is a coordinator/prof he can see it

other things to consider?