User/blog taxonomy associations (student > student blog) sketched out. "No access" messages and matching checks added to front editor (if user is not authenticated or is not assigned to a blog)
Added wrapper to get the blogger obj for the current user, aliasing load()
Assignment/unassignment of student>blog relationships.

Still need to wire up unassignment of all from a given blog: the plan is to function as if relationships are monogamous, however polygamous relationships where one student/user is assigned to multiple blogs will be supported by the underlying framework.