derp

suprise! we use an ORM now. I decided spending time to write a database query for every little DB function is not a good use of time, and spending time to make the DB functions more extensible was just reinventing the wheel. thus, we use SQLAlchemy now. related: issue #6

add page to toggle if a course is active or not

templating: use subclassing in course templates in order to keep breadcrumbs clean

we should merge the dashboard with the course list. however, for now, there are two options for retrieving courses-- one filters by active/inactive, one pulls them all in one big list.

add a function in 'assignment' to identify if the assignment is active or not (available and not yet due)