Fixed all urls that has term code. Term codes
stay consistent throughout different urls.
- created template/session folder
- DetailView now displays one syllabus instead the whole list
- modified forms, views, urls, and templates for 'session'
- sessions are displayed in DetailView
- details.html now shows zeroes in front of month and date
- fixed session.assignment in details.html.
  It doesn't show ['u] anymore.
- add/delete session are inside DetailView