Unit tests for Polling-related CanvasKit  model classes
Reorganize files
Added CKI Section to the header and added a couple of properties on CKIAssignment & CKIEnrollment
Merge pull request #138 from bpluim/header

Added CKI Section to the header and added a couple of properties on CKIA...
Networking Unit Test
Merge pull request #139 from nlambson/master

Mostly Networking Unit Tests
clear cookies before in the login view controller

make sure after checking for basic auth we clear cookies. one schools login page
access was failing because of the basic auth check.
Merge pull request #140 from derrh/master

clear cookies before in the login view controller