advisors/views.py: implemented the basic calls for getting attendance; still needs: model migrations, html
Merge branch 'master' of github.com:kmeht/huxley
migrations: Added six boolean fields for attendance in the Delegate model.

core/models.py: See above. Also added a method "attended_session(session_num)" to check whether a delegate has attended a particular session. Just to make the code easier to read in the view.

advisors/views.py: Fixed getAttendInfo to assume attended_session(num) is on the Delegate model, not the DelegateSlot model.
advisors/views.py: Fixed a syntax error in getAttendInfo(...)
advisors/templates: added check-attendance.html
check-attendance.html: Some basic stuff for the page.
check-attendance.html: It now displays the rows. :)
advisors/views.py: Removed the helper function and made attendance() return a list of delegate objects in the context, since... well... that's all we need really.
style.css: Styling for the check attendance table (mostly the same as preferences, but a few differences in alignment)