django_24 branch merge and schema changes in work_study

[David Burke]

I'm going to move the branch to master! It's done! To upgrade:

run syncdb and 

alter table work_study_studentworker add column transport_exception varchar(2);

update work_study_studentworker set transport_exception = "PM" where fax = 1;

alter table work_study_studentworker add column am_route_id int;

alter table work_study_studentworker add column pm_route_id int;

alter table work_study_workteam add column time_earliest time;

alter table work_study_workteam add column time_latest time;

alter table work_study_workteam add column time_ideal time;