added boiler plate controllers for adding sections
added "sections" model to db
added foreign key to sections table into auth_user
added output for list of sections into section_list
added simple view for sections list
added list of users in a section to section update list
removed word edit from section title
added basic form to add user email addresses
got form to search for emails from list and then add users that are matched
added clear_users method to sections table
added way to clear sections
added way to delete section
removed sections_add_users and sections_remove_users because im not going to use the
added sections_create method
added links to parts of sections
added interface and code to filter assignments by section
merging in section CRUD and models

# Please enter a commit message to explain why this merge is necessary,
# especially if it merges an updated upstream into a topic branch.
#
# Lines starting with '#' will be ignored, and an empty message aborts
# the commit.
Merge pull request #3 from nickdotreid/pip

Added Section CRUD