Basics of registration system integrated into cart and schedule

Updates to schedule template include:

	- made insertItem return the jquery object of the <td> that is
	  inserted so that it can be manipulated
	- made it round all times to the nearest 15 minutes
	- made it do an ajax request to fetch the current schedule
	  on pageload and display it.

Shopping cart / wishlist now displays all sections available for each course
and allows you to register for them. This is very unpolished but is currently
working.