Researchers view

I cloned the functionality of the viz controller/view into a new controller/view named markup. You visit <primary domain>/markup and a dropdown menu will allow you to select from the list of researchers present in the researchers db table. Upon clicking Submit, it will load a view that shows all of the katas from the interrater table, plus all of the katas from the markup_assignments table that matches the chosen researcher. The view cycles and markup katas buttons now load views that receive the researcher name in the get request.

TODO: Currently the markup tool is buggy. Namely: markup may be layered indefinitely over the same range, using delete then deletes the oldest first, but the view shows newest on top, so you don't see anything delete until everything has been deleted. Also: markups might be saving (not sure), but the view is not drawing previously saved markups.